what was he doing ------ you saw him last night

问题描述:

what was he doing ______ you saw him last night
如题.a.while b.when c.before d.after
是用when么?怎么不是while
1个回答 分类:英语 2014-11-10

问题解答:

我来补答
while是时间段
when 表时间点
你看到他的一眼 是瞬间动作
 
 
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