— The man in the red car __________ his ...

— The man in the red car __________ his father.

— Yes. I think so.

A．can be

B．must

C．must be

D．can not

C 【解析】此题考查情态动词在表示推测时的固定用法。肯定性的推测要用must be，否定性的推测要用can’t be，根据语境可知选择C。表示肯定性的推测。

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