Question

【题目】The terrible 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】句意是：当我正在打扫卫生的时候地震发生了。“打扫卫生”是延续性动词，用过去进行时，“地震发生”为短暂性动词，用一般过去时，故选B。