单项选择题

Voices were ______ when the discussion became more heated.

A．risen
B．raised
C．shouted
D．improve
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单项选择题
We grow all our fruit and vegetables, ______ saves money.
A．what
B．which
C．as
D．that
单项选择题
He used to ______ his teaching when he was young.
A．devote to
B．be devoted to
C．devoting to
D．being devoted to
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