单项选择题

All the lights _______ before we left the office.

A．has been turned off
B．have turned
C．had been turned off
D．had turned off
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单项选择题
If you have any trouble, you can turn _______ him for help.
A．for
B．at
C．to
D．in
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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