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

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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
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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
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

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
see sb do sth 固定短语
see过去时用 saw