问题
选择题
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
答案
答案：B
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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
答案：B