Father is sleeping . You’d better quiet .A. to keepB. keepC. keepingD. not keep

问题补充：

Father is sleeping . You’d better quiet .

A. to keep

B. keep

C. keeping

D. not keep

答案：

A. to keep

(答案→)B. keep

C. keeping

D. not keep

解析：you’b better +do sth，你最好做某事。