单项选择题


A．however
B．let alone
C．but
D．as long as
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单项选择题
A．followingB．anotherC．the otherD．therefore
A．following
B．another
C．the other
D．therefore
单项选择题
A．it doesB．does itC．they doD．do they
A．it does
B．does it
C．they do
D．do they
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