29.I ______ home for a week.A.have returned B.have been back C.returned

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29.I ______ home for a week.A.have returned B.have been back C.returned
29.I ______ home for a week.A.have returned B.have been back C.returned

29.I ______ home for a week.A.have returned B.have been back C.returned
选B
这样翻译:我回家已经一个星期了.
表示已经完成的事情,一种延续的状态.