---He

問題詳情：

---He___ be in the classroom, I think.

---No, he ___ be in the classroom. I saw him go home a minute ago.

A. can; may not                        B. must; may not

C. may; can't                          D. may; mustn't

【回答】

C

知識點：情態動詞

題型：選擇題