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

发布时间：2020-08-16 07:07:03


29. 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

网友回答

A. in the back of
B. at the back of
C. to the back of
D. on the back of
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