---- Is Ann knocking at the door?
--- No, it ______ be Ann. She has gone to Beijing.
| A．can’t | B．mustn’t | C．needn’t | D．may not |
---- Is Ann knocking at the door?
--- No, it ______ be Ann. She has gone to Beijing.
| A．can’t | B．mustn’t | C．needn’t | D．may not |
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