问题描述：
-Is this your sister?
-_______________.
A.No,it isn't B.No,she isn't
C.No,this isn't D.No,she is not
最好把每个选项都说一下。
-_______________.
A.No,it isn't B.No,she isn't
C.No,this isn't D.No,she is not
最好把每个选项都说一下。
问题解答：
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