—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

服用铁剂时应注意（）

A、可与茶同服

B、不吃柿子

C、饭前服用

D、可与喹诺酮类抗生素同服

E、不能与菠菜同服