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Mr Smith watched his son__yesterday,A make the bed B to make

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Mr Smith watched his son__yesterday,A make the bed B to make the bed C making thebed
D was making the bed,该选择哪一个?
Mr Smith watched his son__yesterday,A make the bed B to make
C making the bed整理床铺、叠被子
再问: making 为什么加ing?
再答: 因为smith先生看着他做,是正在发生的动作,所以要用现在分词