问题
选择题
While I _______ down the street, I _______ my classmates.
A．was walking; met
B．walked; met
C．was walking; was meeting
D．walked; was meeting
答案
答案：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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