he must have finished his homework last night,didn't he?为什么是didn't
he must have finished his homework last night,didn't he?为什么是didn't
英语人气：307 ℃时间：2019-08-21 16:10:58
优质解答
must,can等表示猜测的时候,就是用助动词来做反意疑问句
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