29. On March 12, the students were planting trees ____ the classroom. A.in the back ofB.at the back

题目简介

29. On March 12, the students were planting trees ____ the classroom. A.in the back ofB.at the back

题目详情


29. On March 12, the students were planting trees ____ the classroom.
A.in the back ofB.at the back of C.to the back ofD.on the back of
题型:单选题难度:偏易来源:不详

答案

 B

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