单项选择题

_____ by the armed police, the bank robbers had no choice but to surrender.

A．To be surrounded
B．Surrounding
C．Having surrounded
D．Surrounded
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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
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
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