单选题Nobody knew that the&nbsp

问题补充：

单选题Nobodyknewthatthereason______hewasoftenblamed.Perhapsthatwas______hemadethesamemistakestoldseveraltimes.A.which; becauseB.why; becauseC.that; thatD.why; that

答案：

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。