--Is Professer Smith giving the speech today?
--It ________ be him. He is abroad right now.
| A．mustn't | B．needn't |
| C．won't | D．can't |
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--Is Professer Smith giving the speech today?
--It ________ be him. He is abroad right now.
| A．mustn't | B．needn't |
| C．won't | D．can't |
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