单项选择题

______ all behavior is learned behavior is a basic assumption of social scientists.

A．It is nearly
B．That nearly
C．Nearly
D．As
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单项选择题
You think it's easy You should try ______ for once.
A．doing
B．doing it
C．to do
D．to do it
单项选择题
William found that even his heavy overcoat was not ______ to keep out the cutting wind.
A．adequate
B．suitable
C．strong
D．positive
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