题文
– Listen ! Is Professor Johnson giving a report in the hall?
– No, it _______ be him. He has gone to America.
| A．needn’t | B．can’t |
| C．may not | D．mustn’t |
– Listen ! Is Professor Johnson giving a report in the hall?
– No, it _______ be him. He has gone to America.
| A．needn’t | B．can’t |
| C．may not | D．mustn’t |
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