They are the old houses in order to set up a new teaching building.A. tearing downB. tear

问题补充：

They are the old houses in order to set up a new teaching building.

A. tearing down

B. tearing up

C. putting up

D. putting down

答案：

(答案→)A. tearing down

B. tearing up

C. putting up

D. putting down

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