问题补充:
单选题Alltheclubmembers_______thefloorwhentheyheardsomeone_______forhelp.A.swept; were shoutingB.swept; shoutedC.were sweeping; shoutingD.were sweeping; shouted
答案:
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
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