i saw him ------his homework just now .应填do 还是 doing
人气：480 ℃ 时间：2020-01-31 05:58:48
解答
doing
see sb. do sth. 是强调动作已经发生了,是瞬间
see sb. doing sth. 是强调动作正在进行,是一个过程
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