Nobody knew that the reason______ he was often blamed. Perhaps that was______ he made the same mistakes told several times.A.which; becauseB.why; becauseC.that; thatD.why; that
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B解析先行词为表原因的the reason, 且从句中的不缺主语和宾语, 所以第一空用关系副词why引导; 第二空是由because引导的表语从句, 即That is/ was because…句式。