Ice and snow ______ houses near the North pole.

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问题 Ice and snow ______ houses near the North pole.

选项 A、used to build
B、are used to building
C、are used to build

答案C

解析 be used to do用来干某事,be used to doing sth.习惯干某事,used to do sth.过去常常干某事。
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