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
Trees take harmful gas from the air, and ______ oxygen (氧气) into the air.
A．let out
B．set off
C．give up
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
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