—IthinkthemanovertheremustbeBob.   --It

問題詳情：

—I think the man over there must be Bob.

    -- It _______ be him. He has ______ to Australia. 

   A. can’t, gone  B. can’t, been  C. may not, been   D. mustn’t, gone

【回答】

A

知識點：情態動詞

題型：選擇題