--Is the man standing outside the teacher’s office Mr. Zhou?
--No, it ______ be him. He has gone to Hong Kong for an academic conference.
| A．mustn’t | B．can’t | C．needn’t | D．couldn’t |
--Is the man standing outside the teacher’s office Mr. Zhou?
--No, it ______ be him. He has gone to Hong Kong for an academic conference.
| A．mustn’t | B．can’t | C．needn’t | D．couldn’t |
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