If I see the twin brothers apart I don’t know______.

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问题 If I see the twin brothers apart I don’t know______.

选项 A、who is who
B、who is whom
C、which is which
D、what is what

答案C

解析 which is which 意思为“谁是谁/哪个是哪个”，无论是人还是物，这种说法都是固定的。

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专业英语四级

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