Mencius believed that the reason man is different from animals isman is good. A. that; tha

问题补充：

Mencius believed that the reason man is different from animals is

man is good.

A. that; that

B. why; because

C. why; that

D. which; that

答案：

A. that; that

B. why; because

(答案→)C. why; that

D. which; that

解析：考查定语从句和表语从句。the reason是先行词，在定从man is different from animals中作原因状语，用why引导； man is good是表语从句，且句子不缺成分，要用that引导。所以选C。