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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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
It rains ______ in Shanghai than in Shenyang.
A) more often
B) most often
C) oftener
D) often
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