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The earthquake ______ when I _______some cleaning.
A.starts, was doingB.started, was doing
C.was starting, was doingD.starts, were doing
B

试题分析:根据语境可知此句的含义地震的时候我正在打扫卫生。此题重点考查的是when引导的状语从句表示当…的时候。其强调的是当一个动作发生的时候另一个动作正在进行,强调状态,故选B。
点评:在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生。while只能表示某一段时间,不能表示某一点时间。在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在。
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