试题与答案

While he ________ his homework , his mot

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题型：选择题

题目：

While   he ________ his homework , his mother came in.

A．does

B．did

C．was doing

D．do

答案：

答案：C

while 引导的时间状语从句，从句往往用进行时态，故选C

考点：过去进行时一般现在时过去完成进行时
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