一道英语选择题,应该很简单.
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一道英语选择题,应该很简单.
15.Who saw it ______ at that time?
A.happen B.happened C.happens D.to happen
15.Who saw it ______ at that time?
A.happen B.happened C.happens D.to happen
see sb do sth 固定短语
see过去时用 saw
see过去时用 saw