单项选择题

A．Congratulations! You’ve been promoted.
B．All right.
C．No problem.
D．Don; t mention it.
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单项选择题
A．Twenty minutes.B．Twenty-five minutes.C．Fifty minutes.D．Fifty-five minutes.
A．Twenty minutes.
B．Twenty-five minutes.
C．Fifty minutes.
D．Fifty-five minutes.
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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