Question

【题目】The earthquake ____ when I ____ some cleaning.

A. starts, was doing B. started, was doing

C. was starting, was doing D. starts, were doing

Answer 1

【答案】B

【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。