单项选择题

It was not until I ______ your letter that I ______ all about the matter.

A．have read; knew
B．would read ;had known
C．read; had known
D．had read; knew
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单项选择题
--You've booked on a two o'clock flight.--What chance ______ of taking a later plane
A．there is
B．it is
C．is there
D．is it
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