______harder, you could have passed this exam.

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问题 ______harder, you could have passed this exam.

选项 A、Were you worked
B、Had you worked
C、If you worked
D、If you have worked

答案B

解析根据句意可知，逗号前面是一个非真实条件句。由主句中的could have passed可知，从句是对过去情况的虚拟，其完整表达为“If you had worked harder”，If可以省略，此时需将助动词had提至主语you之前。故选B。

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