He______the exam, but he failed for his carelessness.

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问题 He______the exam, but he failed for his carelessness.

选项 A、hadn’t passed
B、could pass
C、could have passed
D、had passed

答案C

解析 题句是一个并列句,前半部分表示假设的结果,后半部分表示真实的情况,由连词but连接。这是一种隐含的虚拟语气结构,如:I would have gone to the hospital tosee him,but I was too busy.“我本来是可以去医院看望他的,但就是太忙了(实际上没有去)”,暗含if I had not been so busy的假设条件。假设结果还经常用情态动词的完成式表达,如:They should have studied last night,but they went to theconcert instead.“昨天晚上他们本该学习的,但去听音乐会了。”You needn’t havedressed so formally,for it was only a family party.“你真不必穿得那么正式,不过就是一个家庭聚会嘛.”could have done表示“本来可以、本来能够(但实际上未并实现)”,如:I could have lent you the money,but you didn’t ask me.“我完全可以借给你钱,但你没说呀。”所以根据题句的意思,C项是正确答案。
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