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问题: 模拟题2-32

------Hi, is that Peter Brown?
------Sorry. You _________ the wrong number.
A. must dial B. must have dialed C. should dial D. should have dialed
请详细写出解题的过程和思路。

解答:

选B.
这是一句电话用语。对方已经抱歉说“你拨错了号码”,由此看来“拨号”是在说话之前,所以可以看作是对过去事情的肯定猜测。因此,答案应选must have done形式。