-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.
| A．may not | B．needn’t | C．can’t | D．mustn’t |
-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.
| A．may not | B．needn’t | C．can’t | D．mustn’t |
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