— I think the man over there must be Bob.
— It _______ be him. He has gone to England.
| A．can’t | B．mustn’t | C．couldn’t | D．shouldn’t |
— I think the man over there must be Bob.
— It _______ be him. He has gone to England.
| A．can’t | B．mustn’t | C．couldn’t | D．shouldn’t |
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