The reason for his success is ______ he worked very hard.
A.why
B.that
C.whether
D.how
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B解析试题分析:考查表语从句:句意:他成功的原因是他很努力。当主语是reason的时候,表语从句用that连接。选B。考点:考查表语从句点评:如果表语从句缺少主宾表,用what连接表语从句,如果不缺成分,用that连接,引导表语从句的that在从句中不做成分,只起到连接的作用,疑问词连接表语从句可以从意思辨别。学生要会分析句子成分。