考点：考查动词时态与语态辨析。
9．If we had taken such effective measures much earlier, the riverso seriously now.
A．is not pollutedB．would not be polluted
C．had not been pollutedD．would not have been polluted
点睛：过去完成时表示过去某一时间或动作以前已经发生或完成了的动作，即“过去的过去”，其表达形式为had done，被动语态的表达形式为had been done。
14．________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
6.在“疑问代词+不定式”结构中。
7.let, to blame, to seek等用不定主动形式表示被动含义。
8. with+O.+to do结构中，不定式作宾补时，常用主动表被动，且表将要发生的动作。
分析句子可知，sb be easy to do sth主动形式表达被动含义，符合第一点用法。所以用pick out。故B选项正确
【答案】B
【解析】考查时态和被动语态。句意：由于中国城市化的速度不断提高，到2020年，中国的流动人口预计将超过2亿。结合句意可知，用一般现在时态的被动语态，句子主语是population，单数第三人称形式，故答案为B。该题容易误选D项，是现在预计，而不是将来预计，故用现在时态。
13．A rescue worker risked his life saving two tourists who ________ in the mountains for two days.
1.主语＋be +adj. +to do。
能用于此句型的形容词有: difficult, easy, comfortable, fit, hard, pleasant, tiresome(使人疲劳的), interesting, nice, heavy, dangerous, light, important, etc.注意：当上述形容词在句中作宾语补足语，后接不定式时，不定式也用主动形式表达被动含义。
7．The new library ________; it will be open next year.
A．had been built B．was built
C．was being built D．is being built
【答案】D
【解析】考查时态和语态。句意：图书馆正在建设中；明年开放。根据后面一句可推知，图书馆是正在建设中，所以要用进行时，图书馆是被建的，要用被动。所以本句要用现在进行时的被动语态。故选D。
【答案】D
【解析】
这题考查时态语态，our plan和approve是被动关系，用被动，选择A或D。A项是一般将来时，not until引导的是时间状语从句，不能用将来时，可以用一般现在时或现在完成时，选D。
6．—Will Uncle Peterson come to my birthday party tomorrow?
2．—Have you heard about that school bus accident?
—Yes, fortunately all on board including the driver ________.
A．were savedB．was saved
C．have savedD．has been saved
C．is being repairedD．will be repaired
【答案】C
【解析】
考查时态和语态。句意为：——我们为什么不选那条路以节省时间呢？——通往那条路的桥正在维修。桥正在被维修，故用现在进行时的被动语态。
答案：C
11．103．When you visit our town next August, a modern sports center ________, for the National Games are to be held then.
8．The singer’s music videonearly 9 million times since it was posted on the Internet four weeks ago.
A．viewedB．has viewed
C．was viewedD．has been viewed
【答案】D
【解析】
试题分析：考查动词时态与语态辨析。A. viewed，一般过去式；B. was viewed过去式的被动语态；C. has viewed，现在完成式；D. has been viewed，现在完成式的被动语态。句意：自从四个星期前这位歌手的音乐视频被放在互联网上，这个视频的访问量达到了将近9百万次。since从句用一般过去时，主句用现在完成时has done形式，又因music video是被访问的，故要用被动语态。故选D。
考点:考查句式用法
5．一When shall we start the restoration of the historic buildings?
一Not until our plan________ by the committee．
A．will be approvedB．approves
C．is to approveD．has been approved
A．will be constructing B．will have been constructed
C．has been constructing D．is being constructed
【答案】B
【解析】考查将来完成时态的被动语态。句意：明年八月当你访问我们城镇的时候，一个现代化的体育中心将已经被建成，因为那时全国运动会将被举行。根据时间状语next August，排除C，D两项，再根据a modern sports center和construct是被动关系，排除A项，用将来完成时态的被动语态。故选B项。
A．are trapping B．have been trapped
C．were trapping D．had been trapped
【答案】D
【解析】
考查语态和时态。句意：一个救援人员冒着生命危险挽救了两个被困在山里两天的旅游者。“who ___ in the mountains for two days”是定语从句，修饰two tourists，two tourists和trap之间是被动关系，该空应用被动语态。由risked可知，营救人员救游客是过去的事情，被困两天发生在营救人员救了他们之前，即“过去的过去”，该空应用过去完成时态。综上，D选项正确。
2.主语+be +adj. + enough +to do。
3.主语+be +too +adj. +to do。
4.不定式短语作后置定语时，如果主语是不定式动词短语的逻辑主语。则采用不定式的主动形式表被动概念。
I have a meeting to attend today.
5.There be句型中，用来修饰主语的不定式多用主动。
A．Having explainedB．Having been explained
C．Though it was explainedD．It was explained
【答案】D
【解析】
因为有连词but，前面应是完整的句子，排除A,B; ThoHale Waihona Puke gh不能和but同时使用，所以选D。
15．The classroom ________ by students every day.
【答案】B
【解析】
【详解】
考查过去分词和动词短语。句意：因为她穿着红色的裙子，所以在机场的人群中很容易被认出来。be dressed in穿着……，作状语表状态，故用dressed。sb be easy to do sth主动形式表达被动意思，所以用pick out。故B选项正确。
【点睛】
主动形式表被动意义的不定式
【答案】A
【解析】
考查动词时态和语态。句意为：——你有没有听说那起校车事故？——嗯，幸运的是，车上所有的人包括司机都获救了。由题干中的Have you heard...可知，事故发生在过去，且all为主语，和save逻辑上构成被动关系，故用一般过去时的被动语态，故答案A符合语境。
3．—Are we about to having dinner?
【答案】B
【解析】
选B句意：如果我们早采取有力措施，现在河水就不会污染这么严重。主句表示与现在事实相反的虚拟语气，用would加动词原形。
10．--- Why don't we choose that road to save time?
--- The bridge to it.
A．has repairedB．is repaired
12．Due to the country’s growing rate of urbanization, China’s migrant population _______ to be over 200 million by 2020.
A．predicts B．is predicted C．will have been predicted D．will be predicted
4．It is the third time so far that such a festival ________ in my hometown.