单项选择题

A．Twenty minutes.
B．Twenty-five minutes.
C．Fifty minutes.
D．Fifty-five minutes.
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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
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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