The earthquake when I some cleaning.A．starts, was doing B．started, was doing C．was starting, was doing D．starts, were doing 题目和参考答案——青夏教育精英家教网—

The earthquake ______ when I _______some cleaning.

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

解析试题分析：句意:当我正在打扫房间的时候地震开始了。根据句意可知when 引导的时间状语从句中的动作是正在进行的，第一空应该用一般过去时，表示发生在过去的一个动作。故选B。
考点：考查动词时态。

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