The reason for his success is he worked very hard.A. that B. why C. whether D. How

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【题目】The reason for his success is ______ he worked very hard.

A. that B. why C. whether D. How

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【答案】A

【解析】

试题分析：考查关系词。句意：他成功的原因是他很努力。从句he worked very hard不缺成分，用关系代词that，故选A项。