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
John said that he ______ London twice.
A．have been to
B．have gone to
C．had gone to
D．had been to
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