—The man in a black suit _______ be our youth worker. — I'm sure it _______ be him. I saw him in the laboratory building some minutes ago.

题型：单选题题类：常考题难易度：普通

—The man in a black suit _______ be our youth worker.
— I'm sure it _______ be him. I saw him in the laboratory building some minutes ago.

A、must; can't B、can; mustn't C、can; could D、must; won't

举一反三

—— No, it _____ be him. He is holding a meeting in the office now.

—No, you_________.

— Yes, they can.

— No. I am afraid you ________ leave them at home.

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