题目内容
It ________be Tom's. His is in his schoolbag.
- A.mustn't
- B.can't
- C.shouldn't
- D.may not
B
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-----Someone is knocking at the door.It ____ be Tom .
-----No, it ______ be him ;he has gone to Sydney.
| A.must, can’t | B.might, mustn’t |
| C.may, needn’t | D.can, mustn’t |