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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单项选择题
Could you tell me ______
[A] if the earth went around the sun
B. if the earth goes around the sun
C. if the earth had went around the sun
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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