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The middle-aged scientist who( )abroad for 20 years by the end of next month,is on the way back tohis moterland.A.had been B.is staying C.will have been D.will stay

题目详情
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
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答案和解析
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~