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When my little son was learning to walk,I often saw him_____

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When my little son was learning to walk,I often saw him______down.A.fell B.feel C.felt D.fall
When my little son was learning to walk,I often saw him_____
选D fall down摔倒
我的小儿子在学走路的时候,我经常看到他摔倒.
有下面两种固定搭配要记住:
see sb do sth
see sb doing sth
加动词原形do sth表示看见整个动作发生的过程,或表示看到的事件是真实发生过了的
加动词现在分词doing sth表示看见某个动作正在发生
不只是see,其他的感官动词watch,observe,notice,hear smell,taste,feel等等也是同样的用法.