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

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

【答案】A

【解析】

試題分析：考查關(guān)系詞。句意：他成功的原因是他很努力。從句he worked very hard不缺成分，用關(guān)系代詞that，故選A項(xiàng)。

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