The policeman noticed a boy running _____accross the road wh

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The policeman noticed a boy running _____accross the road when a car was coming toward him.
A.run B.to run C.running D.runs
答案给的是C,为什么不选A?
不是在feel,hear,notice.这些词后的补足语中,用动词原形么?

你只知道感官动词后面的宾补要用原形,却不知道如果当这个动作正在发生,就要用doing这个形式.如：
I saw him dance in the classroom yesterday. （这里的yesterday不是一个具体的时间,所以dance用了原形.）
I saw him dancing in the classroom at 8:00 this morning. （这里的at 8：00是一个具体的时间,所以dance用了dancing这个形式.）
例句中when a car was coming toward him是notice这个动作发生的具体时间,可见这里是强调run在那时正在发生.

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