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--- There is someone at the door. Who ______ it be? Is it the postman? --- No, it ________ be him. I...
题目内容：
--- There is someone at the door. Who ______ it be? Is it the postman?
--- No, it ________ be him. It’s just seven o’clock. It’s too early.
A．may, can’t B．will, won’t C．may, mustn’t D．must, may not
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