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--How long have you ___________ China?

--For three years.

A. come back     B. returned      C. left         D. been away from

-- How long have you ___________ China?

-- For three years.

A. come back            B. returned        C. left         D. been away from

--How long have you           China?       

--For three years.

A. come back        B. returned C. left     D. been away from