Thereason________heisunhappyis___

发布时间：2020-07-09 19:18:02

The reason ________ he is unhappy is ________ he has failed the exam．













A.which; because












B.for that; that











C.why; that











D.for; because

网友回答

C解析前一个空用why引导定语从句，先行词是reason；后一个空用that引导表语从句，说明主语the reason的内容．
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