问题
选择题
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
答案
B
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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
B