67.　此题最佳答案为C，when在此的意思不是“当……的时候”，而是“尽管”、“虽然”的意思。又如：He walks when he might take a taxi.尽管他可以坐出租车，但他却走路。He stopped trying when he might have succeeded next time.尽管他本来下次就可以成功的了，但他却停止努力了。The boy was restless when he should have listened to the teacher carefully.这男孩子本来应该专心听老师讲的，但他却坐立不安。

66.　A. if　　 B. because　 C. when 　D. where　

65.They kept trying _____ they must have known it was hopeless.

64.There are five pairs, but I'm at a loss which _____ to buy.

　A. to be chosen　 B. to choose from　 C. to choose　 D. for choosing

　此题容易误选C，其实应选B。choose表示“选择”，其实是指“选择出来”(pick out)，而不是指“从……选择”，要表示后者的意思，要用choose from，有时也用choose among。同样地，下面两例中的介词from也不可省略：

　Here are some books for you to choose from.这些书可供你选择。

　There are too many cakes to choose from.蛋糕太多了，不知要选哪个好。

　比较：　He didn't know what to choose.他不知道选什么。

　　　　　 He didn't know what to choose from.他不知道从哪儿去选。

63. He was not an actor, who often appeared on stage, _____ a writer, writing stories.

　A. but　　　 B. and　　 C. then　　 D. so

答案选A，主要考查not ... but ...结构。

62.Please make my excuse at tomorrow's meeting-I've got too much work _____.

　A. to do to come　　 B. doing coming　 C. to do coming　　 D. doing to come　

　此题最佳答案为A，不定式to do与have got much work搭配，即have got much work to do (有许多工作要做)；不定式to come与much前的too搭配，构成too ... to ...句式，全句意为“我有太多的工作要做，不能来”

61.I don't know whether to stay in teaching or _____ another job.　

　A. trying getting　　 B. to try to get　　 C. trying to get　　 D. try get

　答案选B，to stay in teaching与to try to get another job为两个并列的选择成分，故同用不定式。另外比较：try to do sth=设法做某事，try doing sth=做某事看看有何效果。

60.He just does what he pleases and never _____ about anyone else.

　A. think　　 B. thinks　　 C. thinking　　 D. thought

　答案选B，thinks与前面的does为并列谓语，同用一般现在时。

59.Few pleasures can equal ______ of a cool drink on a hot day.

　A. some　　B. any　　C. that　　D. those

答案解析：：一看到few pleasures，容易错选D.但后面所设条件为a cool drink,因而正确答案应为C.

58. He transplanted the little tree to the garden _____ it was the best time for it.

　　 A. where　　　　　 B. when　　　　　 C. that　　　　　　 D. until

答案解析：此题容易误选C,把the garden看成是先行词，以为是where引导的表地点的定语从句。其实此题应选B。这是when引导时间状语从句。此句话的汉语意思是：他把小树在最合适的时候移植到花园。