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
Buried under the ground _______.
A．some treasure was
B．was some treasure
C．did some treasure be
D．did be some treasure
单项选择题
There are few places in this country _______ wheat can't grow well.
A．where
B．which
C．when
D．if
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