单项选择题

Schools in the north tend to be better equipped, _____ those in the south are relatively poor.

A．and
B．while
C．but
D．however
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单项选择题
More than three nature reserves have been established in this area _____ hunting is forbidden.
A．that
B．since
C．where
D．if
单项选择题
The shy girl has won the gold medal in the speaking contest, _____ I find hard to believe.
A．that
B．which
C．who
D．whom
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