◎ 题干
Tom sits _______ the classroom while John sits _______ the room.
[     ]
A. in front of; at back of     
B. in the front of; at the back of
C. in front of; at the back of     
D. in the front of; at back of
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Tom sits ____ the classroom while John sits ____ the room. [ ]A. in front of; at back of B. in the front of; at the back of C. in front of; at the back of…”主要考查了你对  【零冠词】【介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。