______ I attended the lecture, I ______a good knowledge of how this happens now.

______ I attended the lecture, I ______a good knowledge of how this happens now.

A. Were; would have had                  B. Had; would have had

C. Had; would have                        D. Were; would have

________ I attended the lecture, I________ a good knowledge of how this happens now．

1. A.
   Were, would have had
2. B.
   Had, would have had
3. C.
   Had, would have
4. D.
   Were, would have