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
问题描述：
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
答
C 根据by the end of next month ， 用将来完成时，所以选C
答
这个月底他就已经在这工作满20年了 到下个月末，他将在这工作20年 到下个月结束，他将在这儿工作20年 到下个月末，他就已经在这工作了
答
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~
答
C