[考题1] I had just steeped out of the bathroom and was busily drying myself with a towel ____ I heard the steps.
A. while B. when C. since D. after
[答案] B
[解析] 下划线处表示 正在这时,突然,四个选项中只有when可以表示此含义。
[考题2] He was about halfway through his meal ____ a familiar voice came to his ears.
A. why B. where C. when D. while
[答案] C
[解析] 下划线处表示 正在这时,突然,四个选项中只有when可以表示此含义。
[考题3] We were swimming in the lake ____ suddenly the storm started.
A. when B. while C. until D. before
[答案] A
[解析] 题意为当我们正在湖里游泳的时候突然暴风雨开始了,表示主句的动作处于从句的动作突然发生时应采用when(while不适合用于这样的语境),when表示当的时候受限制条件最少。
[考题4] Im going to the post office.
____ youre there, can you get me some stamps?
A. As B. While C. Because D. If
[答案] B
[解析] 主句中get me some stamps的动作发生在时间状语从句youre there的过程之中,因此应选while表示这一时间关系(属于while引导时间状语从句的两大基本用法之一)。因此B选项是最佳选项。
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