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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单项选择题
They talked as if they _______ friends for years.
A．were
B．have been
C．would be
D．had been
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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