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I often see an old man--newspaper to make a living on the st

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I often see an old man--newspaper to make a living on the street whenever i pass by the interscenti
选A sell 还是B selling
I often see an old man--newspaper to make a living on the st
B selling
这个题是考察see sb do sth 与see sb doing sth 的区别
“see sb do sth ”表示看到某人做某事了,强调看见谁做过什么事.
如:I saw her clean the classroom.
是说我看到她打扫教室了.(强调做过这件事)
而“see sb doing sth ”表示看到某人正在做某事强调“看见某人正在做某事”
如:I saw her cleaning the classroom.
我看到她正在扫打教室(强调正在做某事)
这个题是说每当我路过的时候,看到一个老人正在为生计而卖报纸.应该是正在做.所以用selling.
像see 这样的感官动词还有hear , feel , watch , notice (注意到)都可以跟do 或doing分别表不同的意思
如:I heard him play the piano.
我听到他弹钢琴了.
I heard him playing the piano.
我听到他正在弹钢琴.