5. They kept trying _________ they must have known it was hopeless.

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

【陷阱】几个干扰项均有可能误选。

【分析】最佳答案选 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。

有许多同学只知道 when 表示“当……的时候”，而不知道它还有其他许多意思，除上面提到的表示“尽管”、“虽然”外，when 还可表示“既然”、“考虑到”。请做下面的试题(答案选D)：

Why do you want a new job _________ you’ve got such a good one already?

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

6. He was about to tell me the secret _________ someone patted him on the shoulder.

A. as                        B. until                        C. when                        D. while

【陷阱】几个干扰项均有可能误选。

【分析】最佳答案选 C。when 意为“这时(突然)”，主要用于某一动作突然发生于另一动作正在进行或刚要发生之时。此时的 when 可以连用副词 suddenly，也可以不连用它，但值得注意的是，同学们不能单独用 suddenly 来代替 when，如下面各题的答案选A，不选B：

(1) I was about to go out _________ the telephone rang.

A. when                        B. suddenly                         C. as soon as             D. directly

(2) We were swimming in the lake _________ the storm started.

A. when                        B. suddenly                        C. until                        D. before

(3) She was walking down the road _________ she heard someone shouting for help.

A. when                        B. suddenly                        C. until                        D. before

7. The fire went on for quite some time _________ it was brought under control.

A. when                        B. since                             C. after                        D. before

【陷阱】几个干扰项均有可能误选。

【分析】最佳答案选 D。before 意为“在……之前”，句意是“大火在得到控制之前燃烧了相当一段时间”。类似地，以下两题也选 before：

(1) He made a mistake, but then he corrected the situation _________ it got worse.

A. until                        B. when                        C. before                    D. as

(2) Someone called me up in the middle of the night, but they hung up _________ I could answer the phone.

A. as                           B. since                        C. until                        D. before

(3) She is getting better by degrees, but it will be some time _________ she is completely well.

A. that                         B. since                        C. when                       D. before

(4) They sat down opposite each other, but it was some moments _________ they spoke.

A. after                        B. before                      C. since                        D. when

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