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____, he would have passed the exam.

A. If he were to study                     B. If he studied hard

C. Had he studied hard                     D. Should he study hard

 46. ____， he would have passed the exam.

 A. If he were to study                  B. If he studied hard

C. Had he studied hard                  D. Should he study hard

12.______, he would have passed the exam.

A. If he were to study　　 　　　 B. If he studied hard

C. Had he studied hard　　 　　　　 D. Should he study hard　

____, he would have passed the exam.

____， he would have passed the exam.