题目内容
While my mother________ some washing, I was making a kite for Mary.
A.did | B.was doing | C.is doing | D.does |
B
while引导的时间状语从句常用进行时态。表示两个动作同时进行。妈妈做饭时,我正在给玛丽做风筝。
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A.did | B.was doing | C.is doing | D.does |