问题
选择题
Mencius believed that the reason why man is different from animals is______Man is good.
A．that
B．what
C．why
D．whether
答案
答案：A
考察从句连词的选择。根据句子结构可知，该句为表语从句，从句中不缺少成分，所以选择that，B在从句中充当主语或者宾语，why充当状语，whether意为是否