题目内容

All the club members _______ the floor when they heard someone _______ for help.
A.swept; were shoutingB.swept; shouted
C.were sweeping; shoutingD.were sweeping; shouted
C解析:
when 引导的时间状语从句,从句的动作发生在主句的动作之中,故选C
练习册系列答案
相关题目