______ worked harder, he would have passed the exam.

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问题 ______ worked harder, he would have passed the exam.

选项 A、He had
B、When he
C、If he
D、Had he

答案D

解析 在省略if的虚拟条件句中,需用倒装结构。C句时态不对,应该是If he had worked harder,表示与过去事实相反。比如:Had you come earlier,you would have met him(= If you had come earlier,you would have met him.)(如果你回来早些,你就看见他了。)
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