单项选择题

You can stay in my room _______ you promise not to use the computer.

A．so far as
B．except
C．unless
D．provided
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单项选择题
It rains _______ in Shanghai than in Shenyang.
A．more often
B．most often
C．oftener
D．often
单项选择题
If you have any trouble, you can turn _______ him for help.
A．for
B．at
C．to
D．in
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