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】C

【解析】句意：当我正在打扫卫生时，可怕的地震开始了。从句中主语I，所以用was，排除D；又因start为短暂性动词，不用进行时态，所以排除C；根据was doing判断earthquake是过去发生，所以用started；故选B