— Listen! Is that Millie playing the piano in the room?
— No, It_____ be Millie, she has gone to London.
| A．may not | B．needn’t |
| C．mustn’t | D．can’t |
— Listen! Is that Millie playing the piano in the room?
— No, It_____ be Millie, she has gone to London.
| A．may not | B．needn’t |
| C．mustn’t | D．can’t |
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