---Can I help you sir?---Yes. I bought this radio here yesterday but it . A. didnt work

问题补充：

---Can I help you, sir?

---Yes. I bought this radio here yesterday, but it .

A. didn work

B. wouldn work

C. can work

D. doesn work

答案：

A. didn work

B. wouldn work

C. can work

(答案→)D. doesn work

解析：doesn’t work 一般现在的情况