单项选择题

(2008) You may borrow this dictionary______you keep it clean.

A．so long as
B．so far as
C．in case
D．even if
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单项选择题
(2008)We will not go to the party______we are politely invited.
A．if
B．however
C．whether
D．unless
单项选择题
(2007)There is a shortage of parking space;______parking is becoming more expensive.
A．however
B．furthermore
C．therefore
D．anyway
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