题干
—That must be Mr. John.
—No, it ________ be him. I saw him off at the airport half an hour ago.
A：may not
B：mustn't
C：can't
D：needn't
答案(点此获取答案解析）
C
—That must be Mr. John.
—No, it ________ be him. I saw him off at the airport half an hour ago.
A：may not
B：mustn't
C：can't
D：needn't
