I wish I（ ）how to repair this tape-recorder. If I did, I（ ）to turn to him for help.

I wish I（ ）how to repair this tape-recorder. If I did, I（ ）to turn to him for help.

A.

know, wouldn't have

B.

knew, would have

C.

knew, wouldn't have 

D.

know, would have

正确答案是C