While I _______ down the street, I _______ my classmates.
A．was walking; metB．walked; met
C．was walking; was meetingD．walked; was meeting
A
while 引導(dǎo)的時間狀語從句，主句的動作發(fā)生在從句的動作之中，主句用一般時態(tài)，從句用進(jìn)行時態(tài)，故答案選A
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