题目内容
All the club members _______ the floor when they heard someone _______ for help.| A.swept; were shouting | B.swept; shouted |
| C.were sweeping; shouting | D.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
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
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