You’d never heard of it before I told you ?A. did youB. didn’t youC. would youD. had you

问题补充：

You’d never heard of it before I told you,?

A. did you

B. didn’t you

C. would you

D. had you

答案：

A. did you

B. didn’t you

C. would you

(答案→)D. had you

解析：y’d heard=had heard，never意为“永远不”，所以反问部分用“had you?”。