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Mr Smith likes watching his grandson ( A) at the pool.A swim

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Mr Smith likes watching his grandson ( A) at the pool.A swim B swims Cswam D to swim 为什么不能选
Mr Smith likes watching his grandson ( A) at the pool.
A swim B swims C swam D to swim
为什么不能选B和C?
grandson是三单,为什么不能加s?
由结构:watch sb.do 决定的,所以用动词原形 swim
而第三人称单数加在第一个动词 like 上了呀
不明白的再问哟,请及时采纳,多谢!
再问: c呢
再答: 答案: A C swam 是过去式, 用于一般过去时, 和 watch sb. do 不搭配,所以不能选