who is she is correct. who is her is not correct unless you use it in a descriptive way in reference to someone around her. Who is …
who is that girl的情况和who is that一样，可以回答“那是安妮”，或“她是安妮”。 英语也是人说话，所以，可不可以这么说那么说，很多情况下你想想 …
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