He had studied hard, he would have been able to pass the exam.()

A. He had studied harder

B. if only he studied more

C. Had he studied harder

D. When he studied more

被请求的机关自收到申请后，置之不理超过（）个月，不予赔偿，请求人可在（）月内向人民法院提起赔偿诉讼。

A.2，2

B.2，3

C.3，3

D.3，2