题目

The reason __________he succeeded in passing the exam is  ___________he worked very hard. A. for; why     B. for; that C. why; that       D. why; how   答案： C 考查句型The reason why. . . is/was that. . . 。此处使用连接词why的原因是其后接从句he succeeded in passing the exam。故C项正确。  

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