组卷网 > 高中英语综合库 > 语法 > 句法 > 复合句 > 名词性从句 > 宾语从句 > 宾语从句的连接词 > 连接代词和连接副词引导的宾语从句
题型:语法填空-单句语填 难度:0.65 引用次数:109 题号:19792106
According to the study, it is hard to prove exactly ________ an animal knows and why it behaves a certain way.(用适当的词填空)

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