nearly all behavior is learned behavior is a basic assumption has been put forward by the social scientists.
A. What, that
B. That, what
C. What, what
D. That, that
网友回答
A. What, that
B. That, what
C. What, what
(答案→)D. That, that
解析：考查复杂句：第一空是主语从句，从句是完整的时候，用that引导主语从句，只起到连接的作用，不做成分，第二空是定语从句，先行词是a basic assumption，定语从句中缺少主语，用that引导定语从句，句意：几乎所有的行为都是习得的行为这是社会科学家做出的基本假设。选D。