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the twins girl are so much alike that I never know ( ) is which空格处填什么啊

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the twins girl are so much alike that I never know ( ) is which
空格处填什么啊
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答案和解析
which,这对孪生子非常相象,我根本没辩认出谁是谁.没有指定前提,不可以用who 或whom