The reason he explained is not I expectedA. why; thatB. why; whatC. that ;whatD. that;

问题补充：

The reason he explained is not I expected．

A. why; that

B. why; what

C. that ;what

D. that; that

答案：

A. why; that

B. why; what

(答案→)C. that ;what

D. that; that

解析：考查定语从句及宾语从句。句意：他解释的原因不是我想要的。前文先行词the reason为定语从句的逻辑宾语，故指物的引导词只能使用that，下文宾语从句缺少逻辑宾语，故引导词用what，选C。