单项选择题

It must have rained last night, ______ the ground is wet.

A．because
B．as
C．since
D．for
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单项选择题
______ would you solve the problem if this method failed
A．What else
B．How else
C．How little
D．How else
单项选择题
She decided to give herself ______ the police.
A．Up to
B．up
C．in
D．to
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