问题
选择题
Tom isn't _____ home, he is _____ his classroom.
A. in; at
B. at; in
C. in; in
D. at; at
答案
答案：B
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Tom isn't _____ home, he is _____ his classroom.
A. in; at
B. at; in
C. in; in
D. at; at
答案：B