问题
选择题
In the ______ office, there is a television. [ ]
A. teacher
B. teachers'
C. Teacher's
D. teachers
答案
B
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In the ______ office, there is a television. [ ]
A. teacher
B. teachers'
C. Teacher's
D. teachers
，正电荷
，正电荷
，负电荷
，负电荷