三、while引导的状语从句

尤其要注意while表示“尽管”“虽然”时的用法(此时它引导的不是时间状语从句，而是让步状语从句——此用法许多同学并不熟悉，值得特别注意!)。如：

______ I really don’t like art, I find his work impressive. (山东卷)

A. As B. Since C. If D. While

【解析】答案选D。while在此表示“尽管”“虽然”，又如：While the work was difficult, it was interesting. 尽管工作有难度，但很有趣。/While I understand what you say, I can’t agree with you. 虽然我理解你的意思，但我还是不同意。

另外，while表示对比的用法也值得注意(此时它表示“而”)。如：

The cost of living in Glasgow is among the lowest in Britain, ______ the quality of life is probably one of the highest. (天津卷)

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

四、when引导的状语从句

对于when的用法，同学们最熟悉的是表示“当……的时候”。如：

—Where’s that report?

—I brought it to you ______ you were in Mr. Black’s office yesterday. (北京卷)

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

【解析】答案选B。将四个选项逐一填入空格处，只有填when时，意思最通顺。句意为：当你昨天在布莱克先生办公室时我就带给你了。

但是when还有一个用法，就是表示“既然”。如：

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

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

还有一点也需注意，就是when表示“这时(突然)”的用法。如：

1. I had just stepped out of the bathroom and was busily drying myself with a towel ___B___ I heard the steps. (湖南卷)

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

2. He was about halfway through his meal ___C___ a familiar voice came to his ears. (辽宁卷)

A. why B. where C. when D. while