2. 外语
  3. _________ men have learned much from the behavior of animals is hardly new.

_________ men have learned much from the behavior of animals is hardly new.

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问题 _________ men have learned much from the behavior of animals is hardly new.
选项 A、That
B、What
C、Whether
D、Which
答案A
解析 “That”引导名词从句，作句子的主语。例如：That he will succeed is certain．
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