◎ 题干
There are three floors ______ this building and my classroom is ______ the second floor.      
[     ]
A. on; in
B. in; on
C. of; on
D. in; in
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There are three floors ______ this building and my classroom is ______ the second floor.[ ]A. on; inB. in; onC. of; onD. in; in…”主要考查了你对  【介词】  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。