--Who’s the man over there?Is it Mr Black?
----It _____be him.He’s much taller.

—–I think the man over there must be Tom.—–It _____ be him. He has ______ to America.

A．can’t；gone                          B．can’t；been

C．may not；been                         D．mustn’t；gone

 —I think the man over there must be Bob.

—It ______ be him. He has gone to Paris.

A．can’t            B．can              C．may not           D．mustn’t