Don't keep your mouth if you want to improve your spoken English.A. shutB. shuttingC. shu

问题补充：

Don keep your mouth if you want to improve your spoken English.

A. shut

B. shutting

C. shutted

D. to shut

答案：

(答案→)A. shut

B. shutting

C. shutted

D. to shut

解析：keep这里意思是；使保持，后面要求接形容词用它的宾补，而不是keep sth. from doing.。C、D两选项不符合题意。