问题描述：
选择填空:there are some cars----the building.A.in front of B.in the front of C.at front of
D.at the front
2.there is a blackboard----the classroom
A.in front of B.in the front of C.at front of D.at the front of
D.at the front
2.there is a blackboard----the classroom
A.in front of B.in the front of C.at front of D.at the front of
问题解答：
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