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
He asked who was the man _______.
A．being operated on
B．operating on
C．operate on
D．operates on
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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