__________ men have learned much from the behavior of animals is hardly new.A:That B:Those C:What D:Whether

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__________ men have learned much from the behavior of animals is hardly new.A:That B:Those C:What D:Whether
__________ men have learned much from the behavior of animals is hardly new.
A:That
B:Those
C:What
D:Whether

__________ men have learned much from the behavior of animals is hardly new.A:That B:Those C:What D:Whether
A
由that引导主语从句
主语从句表示一个既定事实

A that引导的主语从句
人们从动物的行为上学到了许多已不再新鲜。