问题
选择题
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
答案
答案：B
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。