141] The research is so designed that once ______ nothing can be done to change it.

[译文] 这个研究一旦开始什么都不能使它改变。

　 A. begins 　 B. having begun

　 C. beginning 　 D. begun

[答案及简析] D。 once begun是once引导的条件状语从句的省略形式。= Once it is begun

140] Meeting my uncle after all these years was an unforgettable moment, ____ I will always treasure.

[译文] 多年不见叔叔的见面时我永远珍惜的美好时刻。

　 A. that 　 B. one

　 C. it 　 D. what

[答案及简析] B。 不定代词one作moment的同位语。

139] Tom was a black slave and he at last ______ the cotton farm to join the North Army.

[译文] 汤姆是一个黑奴，他终于逃出棉田加入了北方大军。

　 A. left 　 B. escaped

　 C. ran away 　 D. fled

[答案及简析] D。 作为奴隶只能逃跑，排除leave；escape 和run away 都是不及物动词。

138] In my bedroom, I have a small desk _____.

[译文] 在我的寝室，我有一个小书桌写东西。

　 A. to write 　 B. writing

　 C. to write on 　 D. to write with

[答案及简析] C。 have sth. to do 的句型中不定式作定语只能是及物动词，和被修饰的名词有动宾关系。

137] Everyone working on Sunday will have _____ pay doubled.

[译文] 每一个周六加班的人都会得到加倍的工资。

　 A. its 　 B. their

　 C. ones 　 D. one

[答案及简析] B。 everyone做主语其物主代词用their；one作主语时用ones。

136] _____ leaves the room last ought to turn off the lights.

[译文] 无论谁最后一个离开房间都得关掉灯。

　 A. Anyone 　 B. The person

　 C. Whoever 　 D. Who

[答案及简析] C。 主语从句中缺主语；同时表示强调故用whoever。

135] We must find a dictionary. ____ will do.

[译文] 我们应该找到一本辞典。任何一本都可以。

　 A. Some 　 B. Any

　 C. Every 　 D. Each

[答案及简析] B。 any表示"任何"一本都行。

134] The sun is bigger than the moon, _______ we all know it.

[译文] 太阳比月亮大，我们大家都知道。

　 A. as 　 B. which

　 C. and 　 D. that

[答案及简析] C。 此句不缺任何成分，不是定语从句，只能是并列句。

133] We found Marry’s brother to have _____ more story books than Ann’s.

[译文] 我们发现玛丽的故事书要比安莉的多得多

　 A. much 　 B. too much

　 C. by far 　 D. far

[答案及简析] C。 修饰可数名词不能用much；by far可以用于修饰比较级。

132] ____ knocked down and hurt worried her friends.

[译文] Kate的被撞倒和受伤使她的朋友很着急。

　 A. Kate’s being 　 B. Kate was

　 C. Kate being 　 D. Kate had been

[答案及简析] A。 当动名词的复合结构作主语时，要用规范的形式，因此排除Kate being。