How soon will you come back from Dalian ( ) a week.A.on B.in C.fo_英语解答

How soon will you come back from Dalian ( ) a week.
A.on B.in C.for D.since

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解答

B in
How soon will you come back from Dalina?In a week.
你多长时间能从大连回来?一个星期之内.