单项选择题

(2009)Inexperienced as he is , he has succeeded______other experienced researchers fail.

A．where
B．what
C．which
D．how
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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
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
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