51. Oh, what a nuisance! It ________ so easy for me to bring those photographs I wanted to
show you, and have left them on the table at home.
A. would have been
B. had been
C. would be
D. was
52. We have done things we ought to have done and __________ undone things we ought to
have done.
A. leaving
B. left
C. will leave
D. leave
53. Water enters into a great variety of chemical reactions, ________have been mentioned in previous pages.
A. a few of it
B. a few of that
C. a few of them
D. a few of which
54.________ I admit that there are problems, I don’t think that they cannot be solved.
A. Unless
B. Until
C. As
D. while
55. They tried to restrict access to ________they believed to be dangerous areas.
A. what
B. which
C. that
D. everywhere
56.You have put the milk in the ice-box; I expect it ________ drinkable by now.
A. became
B. had become
C. has become
D. becomes
57. John D. Rockefeller, ________, owned 90 percent of all American oil refineries.
A. as still a young man
B. while still a young man
C. young man however
D. in spite a young man
58. They will have you_________ if you don’t pay your taxes.
A. to be arrested
B. arrest
C. arrested
D. being arrested
59. The policy accused him of setting fire to the building but he denied ________ in the area on the night of the fire.
A. to be
B. to have been
C. having been
D. be
60. The Managing Director said that improving relations with the association would not be easy, but they________ to try.
A. would have decided
B. decide
C. have decided
D. had decided
B. bond。
先上图（有图有真相）
bud 绑缚
bud是一个语根，含义是绑缚，它决定了单词的原始含义。
build［bIld］v.建造，建筑 n.构造，体格，体形
build=bu(il)d
【理解助记】原始人为建造房屋将树枝捆绑在一起→build建造，建筑。
谐音：（遮风挡雨）必有的→build建筑。
提醒：单词中经常会出现两个元音字母连写的情况，绝大部分情况下都是第二个元音字母是插入码，即在单词的演变过程中，插入元音字母使其与其它单词区别开来，对单词的原始含义不起决定作用。
语根中尾辅音字母前可以插入
l、r发儿化音，不影响其原始含义。
bot 记忆窍门
语根bud变为bot，其基本意思没发生改变，元音字母a、e、i、o、u之间相互转换并不影响其原始含义；D族辅音字母d、t经常相互转换并不影响其
原始含义。
booth［bu:W］n.售货亭，货摊
booth=bo(o)t 结构性后缀h
【理解助记】booth本义是建造的小房子，住所，引申为现在的货摊；售货亭。
【例句】There is a booth round the corner. 转角处有一个货摊。
bet 记忆窍门
语根bot变为bet，其基本意思没发生改变。
alphabet［5AlfEbet］n.字母表
alphabet=alpha bet
【理解助记】alpha希腊语第一个字母α，本义是牛bet(=beta)希腊语第二
个字母β，本义是房子→在古代，牛和房子是最重要的资产，所以后来用这两
个希腊字母α，β代替整个字母表。
fin 绑缚（限制）
fin是一个语根，含义是绑缚，它决定了单词的原始含义。
confine v.幽禁，监禁，限制，把……局限于 n.范围，边界
confine=前缀con fin 词性后缀e
【理解助记】con表加强fin绑缚→把某人绑起来限制其自由→confine幽禁，限制，监禁。
【搭配】be confined to 局限于，（被）限制，封闭在；beyond the confine of 超出……的范围
define v.划定界限，下定义，确定……的范围，解释
define=前缀de fin 词性后缀e
【理解助记】de强调fin限制→限制在……范围内→define划定界限；下定义本身就是对某事物划定界限。
finite adj.限定的，有限的；【语】限定式的
finite=fin 形容词后缀ite
【理解助记】fin限制ite后缀→本义是有限制的→finite限定的，有限的。
affinity n.姻亲关系；构造相似，特点相近；喜爱；亲和性，亲和力
affinity=前缀af fin 名词后缀ity
【理解助记】af强调fin限制→受血缘关系的限制→affinity姻亲关系。
law 束缚（法律）
law是一个语根，含义是束缚，它决定了单词的原始含义。
law n.法律，规则，定律 vi.起诉
【理解助记】本义是束缚→对行为的约束→law法律。
法律是对人的行为的一种约束，俗话说“绳之于法”。
lawsuit=law suit
【理解助记】law法律suit起诉→lawsuit诉讼案件。
leg 记忆窍门
语根law变为leg，其基本意思没发生改变，辅音字母w、g经常相互转换并不影响其原始含义。
legal adj.法律上的，合法的；法定的
legal=leg 形容词后缀al
【理解助记】leg法律al……的→legal法律上的；合法的。
legitimate adj.合法的，法律认可的；合乎逻辑的 vt.使合法legitimate=leg itim 词性后缀ate
【理解助记】leg法律itim(=item)条款ate后缀→用法律条款约束人的行为lic 记忆窍门
语根leg变为lic，其基本意思没发生改变，C族辅音字母
c、g、k、q、j、h、s、x、z经常相互转换并不影响其原始含义。
license/ce n.许可（证），执照 vt.许可，发执照
licence=lic 名词后缀ence
【理解助记】lic法律ence后缀→法律上认可的、合法的证件→licence许可（证），执照。
练习题：（答对奖励50HY）
A. legal。