单项选择题

You can fly to London this evening ______ you don"t mind changing the flight in Paris.

A．until
B．if
C．where
D．before
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单项选择题
She didn t tell the reason ______ she was absent from the important lecture.
A．what
B．which
C．how
D．why
单项选择题
It is a fact ______ most deaths from lung cancer are caused by smoking.
A．that
B．how
C．what
D．which
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