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Mary is watching his brother ------------soccer A.playing B.

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Mary is watching his brother ------------soccer A.playing B.to play C.plays D.played
SOS
Mary is watching his brother ------------soccer A.playing B.
A
再问: 为什么不是B
再答: 感官动词后面不加to,感官动词后面可以接三种形式 watch/see等等+sb./sth do sth 表主动, watch/see等等+sb./sth doing sth表主动,正在进行 watch/see等等+sb./sth done表被动