—Someone will come to our music club tomorrow. I guess it's Mary. —It ______ be Mary. She left for England yesterday a

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1. (2021九上·拜泉月考) —Someone will come to our music club tomorrow. I guess it's Mary.
—It ______ be Mary. She left for England yesterday and will stay there for a week.

A . mustn't B . needn't C . can't

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