– you turn down your radio please? –Yes I can.A. MayB. NeedC. MustD. Can

问题补充：

– you turn down your radio, please? –Yes, I can.

A. May

B. Need

C. Must

D. Can

答案：

A. May

B. Need

C. Must

(答案→)D. Can

解析：本题的含义为你能把收音机声音调小一点儿吗，回答语用can，故本题用can构成的一般疑问句，故本题选D。