单项选择题

He is ______ tired that he can't walk any further.

A．very
B．too
C．so
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单项选择题
There are some trees on ______ side (s) of the street.
A．both
B．every
C．either
单项选择题
--Must I turn off the light when I leave --No, ______
A．you mustn't
B．you can't
C．you needn't
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