单项选择题

______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.

A．As
B．With
C．Once
D．While
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单项选择题
I'm willing to lend you a hand ______ busy I'm for the moment.
A．because
B．but that
C．but
D．however
单项选择题
______ nearly all behavior is learned behavior is a basic assumption (假设) of social scientists.
A．/
B．That
C．It is acceptable
D．When
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