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The missing boy was last seen ____ near the river.

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The missing boy was last seen ____ near the river.
A,to play
B,to be playing
C,play
D,playing
为什么不选A,这里被动语态应该加to啊?选什么?为什么?
The missing boy was last seen ____ near the river.
选D.
The missing boy was last seen _playing_ near the river.
这里是see sb. doing sth. 变化而来.see sth. doing sth.表示看到一个瞬间,而不是全过程.
假如本句主动态改为:I saw him play near the river.表示:我看到他在河边玩的全过程.
那么本句就该选A.
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