If I had tried my best last term, I more progress then.
A. could make
B. would make
C. must have made
D. could have made
网友回答
A. could make
B. would make
C. must have made
(答案→)D. could have made
解析：虚拟语气的考点。根据从句谓语的形式had done和主句中的then ，说明是表示与过去事实的虚拟。would/should/could/might+have done 是表示与过去事实相反的主句谓语形式。