Nobody knew that the reason he was often blamed. Perhaps that was he made the same mistakes told several times.
A. which; because
B. why; because
C. that; that
D. why; that
网友回答
A. which; because
(答案→)B. why; because
C. that; that
D. why; that
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。