请在下列句子中选出字形有错误的一项

A．置若罔闻支支吾吾定期会晤休养生息加强修养

B．一泻千里烟消云散嬉笑怒骂文恬武嬉踊跃参加

C．和颜悦色意气用事泱泱大国偃旗息鼓九州同庆

D．青春永驻化装侦察振聋发聩振振有词山洪爆发

---Sam becomes the top student because he is very clever.

---_______. Without the help of his hardworking teachers, he can’t make it at all.

A．I don’t think so.

B．I’m afraid so.

C．I agree with you.

D．I don’t know.