问题
选择题
____you had worked hard, you would have easily passed the final test.
A．When
B．If
C．Thought
D．Since
答案
B
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.
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