--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

科目 英语   题型 单选题   难度 容易

知识点： 情态动词的被动语态