you had worked hard you would have easily passed the final test.A. WhenB. IfC. ThoughtD.

问题补充：

you had worked hard, you would have easily passed the final test.

A. When

B. If

C. Thought

D. Since

答案：

A. When

(答案→)B. If

C. Thought

D. Since

解析：由句子结构可知，这是一个与过去事实相反的虚拟语气。从句的形式为If + had done, 主句用should/would/might/could have done.