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On March 12,the students were planting trees ____ the classr

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On March 12,the students were planting trees ____ the classroom.
A.in the back of B.at the back of C.to the back of D.on the back of
Move a few steps,and the oil-paintings look better ____.
A.in the distance B.at once C.in the open air D.at a distance
第一题 B
at the back of 是固定用法
第二题 D
in the distance远处
at a distance在一定距离内
其他两项意思不对