题目内容
I left my umbrella in my room.Could you wait ________ I go back to get it?
- A.when
- B.if
- C.while
- D.before
C
考查when和while的区别。when和while都是从属连词,表示“当……的时候”,用来引导时间状语从句。when引导从句表示的动作一般发生在主句动作之前,而while引导的从句的谓语动词与主句的动作只能同时发生,不可一前一后的发生。
考查when和while的区别。when和while都是从属连词,表示“当……的时候”,用来引导时间状语从句。when引导从句表示的动作一般发生在主句动作之前,而while引导的从句的谓语动词与主句的动作只能同时发生,不可一前一后的发生。
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