【題目】--- Oh, dear! A power cut!

--- Sorry, I didn’t know you _________ the washing machine.

A. are using B. used C. use D. were using

【答案】D

【解析】試題分析:句意:-哎吆!停電啦!-對不起,我不知道你在使用洗衣機(jī)。表示過去某一時間正在進(jìn)行的動作用過去進(jìn)行時,所以選D。

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