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The middle-aged scientist who( )abroad for 20 years by the e

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The middle-aged scientist who( )abroad for 20 years by the end of next month,is on the way back to
his moterland.
A.had been B.is staying C.will have been D.will stay
C,by the end of next month是典型的完成式标志,但是next month 表示将来,因此应该用将来完成式,即will have been~