I saw an old man___(to cross;crossing) the road

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I saw an old man___(to cross;crossing) the road

I saw an old man___(to cross;crossing) the road
I saw an old man___(to cross;crossing) the road

I saw an old man___(to cross;crossing) the road
see是系动词,其后应用动名词形式

这里应该填crossing.see是感观性动词.后面只能接动词原形或ing形式.其中ing表示的是正在进行时.可以是现在进行时也可以是过去进行时

你好,是crossing