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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单项选择题
Food, clothing and shelter are the ______ needs for all of us.
A．careful
B．attractive
C．strange
D．basic
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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