––IsawMarkontheplaygroundjustnow.––No,it

問題詳情：

––I saw Mark on the playground just now.

––No, it _______ be him. He is ill in bed at home.

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

【回答】

C

知識點：情態動詞

題型：選擇題