问题
单项选择题
Where is Mr.Green?（）the library.
A.He's gone to
B.He's been to
C.He isn't in
D.He's out
答案
参考答案：A
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Where is Mr.Green?（）the library.
A.He's gone to
B.He's been to
C.He isn't in
D.He's out
参考答案：A