Someone is knocking at the door. It my mother. It's time for her to be back. A. can be B. may not be C. must be D. mustn't be 【查看更多】

 

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Someone is knocking at the door. It            my mother. It's time for her to be back.

[     ]

A. can be
B. may not be
C. must be
D. mustn't be

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Someone is knocking at the door. It ____ my mother. It's time for her to be back.

[     ]

A. can be
B. may not be
C. must be
D. mustn't be

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