By the end of the year,she _____ as a broadcaster for thirty years.A) had been working B) will have been workingC) would have worked D) is working

By the end of the year,she _____ as a broadcaster for thirty years.A) had been working B) will have been workingC) would have worked D) is working
By the end of the year,she _____ as a broadcaster for thirty years.
A) had been working B) will have been working
C) would have worked D) is working

By the end of the year,she _____ as a broadcaster for thirty years.A) had been working B) will have been workingC) would have worked D) is working
选B
By the end of the year,she will have been working as a broadcaster for thirty years.
截止今年年底,她做播音员就达三十年了.
主要在于对the year的理解,一般应该看成是今年,相当于this year.这样就是将来完成进行时.

a

B,到年末，还有一段时间，所以用will将来时，for thirty years说明之前一直到现在，还要继续工作，所以用现在完成进行时。

A 看到BY，后面一般是过去完成时 ，for thirty说明是一段时间，所以是been working
所以选A