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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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
The new airport ______ if they had not stopped working on it.
A．would complete
B．had been completed
C．had completed
D．would have been completed
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