单项选择题


A．tighter and tighter
B．tight and tight
C．tight for tight
D．tighter for tighter
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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
单项选择题
We grow all our fruit and vegetables, ______ saves money.
A．what
B．which
C．as
D．that
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