happen
see sb.do/doing sth.
而happen 是瞬间动词在这里只能用原形
Did you see the accident happen
Did you see the accident happen
Did you see the accident ________ 是happen 还是happened,为什么
Did you see the accident ________ 是happen 还是happened,为什么
英语人气：556 ℃时间：2020-01-30 21:42:49
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