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
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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
单项选择题
Our main concern is to ______ the living standard of the people.
A．raise
B．rise
C．arise
D．arouse
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