i __(be)in china for two months.怎么填?

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i__(be)inchinafortwomonths.怎么填?i__(be)inchinafortwomonths.怎么填?i__(be)inchinafortwomonths.怎么填?havebee

i __(be)in china for two months.怎么填?
i __(be)in china for two months.怎么填?

i __(be)in china for two months.怎么填?
havebeen

have been