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问题: 请解释一下,谢谢!!

_____ to make a decision?
A.Whom is it up to B.Whom is it up
C.Who is it up D.Who it is to
答案是A,不知是什么意思.能分析吗?

解答:

it is up to sb to do sth 意思是:轮到某人做某事。这里对sb提问。