单项选择题

All flights _____ because of the terrible weather, the Smiths had to go back to the hotel.

A．had been canceled
B．being canceled
C．having been canceled
D．were canceled
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单项选择题
I’m sorry, but there are _____ for Sunday’s concert.
A．no tickets available
B．not tickets available
C．no available tickets
D．not available tickets
单项选择题
I can’t stand him. He always talks as if he _____ everything.
A．know
B．has known
C．knew
D．had known
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