Mr.Green's already back home,_____he?A.hasn't B.has C.isn't D.is正确答案是C,但是为什么啊,

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Mr.Green's already back home,_____he?A.hasn't B.has C.isn't D.is正确答案是C,但是为什么啊,
Mr.Green's already back home,_____he?A.hasn't B.has C.isn't D.is
正确答案是C,但是为什么啊,

Mr.Green's already back home,_____he?A.hasn't B.has C.isn't D.is正确答案是C,但是为什么啊,
应该选C.如果选A时原句already后应加been.