问题描述：
下面这个空上该填什么,按规定用Is this提问应用it is来回答,可这里后面又是my aunt son.,咋办?
Is this your brother?No,_____isn't.He is my aunt son.
Is this your brother?No,_____isn't.He is my aunt son.
问题解答：
我来补答展开全文阅读