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(shí)候地震開始了。根據(jù)句意可知when 引導(dǎo)的時(shí)間狀語(yǔ)從句中的動(dòng)作是正在進(jìn)行的，第一空應(yīng)該用一般過(guò)去時(shí)，表示發(fā)生在過(guò)去的一個(gè)動(dòng)作。故選B。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)。

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