--Has he passed the exam yet? ---No He it if he had studied harder.A. would passB. passed

问题补充：

--Has he passed the exam yet? ---No,He it if he had studied harder.

A. would pass

B. passed

C. should has passed

D. would have passed

答案：

A. would pass

B. passed

C. should has passed

(答案→)D. would have passed

解析：这是虚拟条件句,表示过去事实相反,所以选用D.