— Who’s singing in the next room?
— It ______ be Mary. She ______ New York.
| A．mustn’t, is in | B．must, has gone to | C．could, has been in | D．can’t, has gone to |
— Who’s singing in the next room?
— It ______ be Mary. She ______ New York.
| A．mustn’t, is in | B．must, has gone to | C．could, has been in | D．can’t, has gone to |
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