单项选择题

______ do you change the cell for your watch ( )

A．How many
B．How often
C．How little
D．How soon
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She decided to give herself ______ the police. ( )
A．up to
B．up
C．in
D．to
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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