单项选择题

Ice and snow ______ houses near the North pole.

A． used to build
B． are used to building
C． are used to build
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单项选择题
These old men need some help, ______
A． needn't they
B． don't they
C． need they
单项选择题
He waited for the bus for an hour. ______.it arrived.
A． At last
B． At once
C． In time
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