问题

Someone is knocking at the door. Who may it be? —It ______ be Tom. He is still in the school.

A:can’t
B:mustn’t
C:couldn’t
D:may not

正确答案是：

标签： knocking , may , someone

同类题型

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Did you see him yesterday?—No, when I got to the airport, he a taxi for home.

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