题目内容

While I _______ down the street, I _______ my classmates.
A.was walking; metB.walked; met
C.was walking; was meetingD.walked; was meeting
A
while 引导的时间状语从句,主句的动作发生在从句的动作之中,主句用一般时态,从句用进行时态,故答案选A
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