The earthquake ______ when I _______some cleaning.

A.starts, was doing B.started, was doing
C.was starting, was doing D.starts, were doing

B

解析試題分析:句意:當(dāng)我正在打掃房間的時候地震開始了。根據(jù)句意可知when 引導(dǎo)的時間狀語從句中的動作是正在進行的,第一空應(yīng)該用一般過去時,表示發(fā)生在過去的一個動作。故選B。
考點:考查動詞時態(tài)。

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