单项选择题

(2011) You won’t pass your examination____you study hard.

A．after
B．when
C．unless
D．if
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单项选择题
(2010)____poor the living condition is, we must try our best to put up with it.
A．No matter however
B．No matter how
C．Whatever
D．How
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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