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【题目】When I got to the classroom, my friend Bob__the floor.

A. is cleaningB. was cleaningC. cleanedD. has cleaned

【答案】B

【解析】

句意:当我进教室时,我的朋友鲍勃正在打扫地板。

考查时间状语从句、时态。A. is cleaning(现在进行时);B. was cleaning(过去进行时);C. cleaned(一般过去式);D. has cleaned(现在完成时);when引导的时间状语从句指特定时间正在发生的动作,根据主从句时态一致的原则,判断主句用过去进行时,故选B

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