单项选择题

He asked who was the man _______.

A．being operated on
B．operating on
C．operate on
D．operates on
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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
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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