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
You can stay in my room ______ you promise not to use the computer.
A．so far as
B．except
C．unless
D．provided
单项选择题
Buried under the ground ______.
A．some treasure was
B．was some treasure
C．did some treasure be
D．did be some treasure
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