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（题文）There is a blackboard________ our classroom. Our teacher was standing ________ the blackboard at...
题目内容：
（题文）There is a blackboard________ our classroom. Our teacher was standing ________ the blackboard at this time yesterday.
A. in front of; in the front of B. in the front of; on
C. in the front of; in front of D. in front of; in
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