—It ________ be John who is in the office.—No, it ________ be him. I saw him off

题干

—It ________ be John who is in the office.
—No, it ________ be him. I saw him off at the airport half an hour ago.

A．can’t; can’t	B．must; can’t
C．must; mustn’t	D．may; mustn’t

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