A. to have closed B. to close C. having closed D. closing
答：B。forget+动词不定式作宾语表示动作尚未发生。I am afraid I will forget to give the letter to him.我担心我会忘了把这封信交给他。（动词不定式表示一个发生在forget 之后的一个将来的动作。）forget +动名词作宾语，表示动作已经发生。I forget giving the letter to him.我忘了已经把信给他了。（动名词表示一个发生在forget之前的动作。）类似的动词有remember，regret等。本句的意思是“走的时候别忘了关窗户。”动作还没有发生，因此用动词不定式。
29. You bad better _____ a doctor as soon as possible.
A. seeing B. saw C. see D. seen
答案：C。句型：had better （had best） + 原形不定式 最好; had better （had best）not+原形不定式，最好不要。You had better not go你最好别走。因此只有C符合此用法。
30. The old man is used to _____ early in the morning.
A. exercise B. exercising C. exercised D. exercises
答案：B。be used to doing sth：习惯于做…。句中的to是介词，因此后面接动名词。
31. Before joining the army, he spent a lot of time in the village _____ he belonged.
A. to which B. which C. to where D. at which
答案：A。belong to ：属于 。因此选 to which。
32. Do you mean this is the _____ decision you have made after thinking for hours?
A. upright B. ultimate C. total D. tight
答案：B。ultimate：最终的，最后的。Their ultimate destination was Paris.他们最后的目的地是巴黎。本句的意思是：“这就是你经过几个小时的思考后做出的最后决定吗？”因此只有B 最符合题意。upright：挺直的，垂直的。A tall upright old man个头高、腰背挺的老人。total：总的，全部的。The total number of passengers旅客总人数。tight紧的，牢固的。This drawer is so tight that I can’t open it.这抽屉太紧，我开不开。
33. It is because she is very devoted to her students _____ she is respected by them.
A. that B. which C. what D. who
答案：A。本句为强调句型。It is（was）…that/who；who （只能强调人）；that（可强调人和物）因为本句是强调原因，所以只能选择A。 又如：It is tomorrow that they will have a meeting.就在明天他们要开会。（强调时间状语）It is they who（that）will have a meeting tomorrow.就是他们明天要开会。（强调人，可以用who或that ）
34. I gave John a present but he gave me nothing _____.
A. in return B. in turn C. in advance D. in vain
答案：A。in return（for）：作为（对…的）报答（或回报）；作为（对…的）交换：What can I do in return for your kindness? 我怎么才能报答你的好意呢？所以只有A最符合题意。in turn：依次，轮流。We’ll cross the bridge in turn.我们将挨个过桥。in advance ：预先，事先。You ought to have told me in advance.你本该事先告诉我的。in vain：徒然，白费力。All our work was in vain.我们白干了一场。
35. I cannot tell the _____ difference between the twins.
A. slender B. single C. simple D. slight
答案：D。slight：轻微的，少量的。He speaks English with a slight German accent.他讲英语略带德国口音。slight difference：细微的差别。因此只有D最符合题意。slender：苗条的，修长的，微小的，微薄的。She was slender and had long dark hair.她身材苗条，头发又黑又长。a slender income微薄的收入，slender confidence：欠缺的信心。Single：单一的A single light was burning in the room.房间里点着一盏孤灯。simple：简单的，简易的。The point I am making is a very simple one.我想提出的论点很简单。
