---Is that Mr Smith?
---It __________ be him. He is in New York on business these days.
| A．may not | B．needn’t | C．can’t | D．mustn’t |
---Is that Mr Smith?
---It __________ be him. He is in New York on business these days.
| A．may not | B．needn’t | C．can’t | D．mustn’t |
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