By the end of this year, he______in this factory for as many as thirty years.A、w

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问题 By the end of this year, he______in this factory for as many as thirty years.

选项 A、will work
B、will be working
C、have worked
D、will have worked

答案 D

解析本题考查将来完成时。by引导时间状语时，表示“到……时候为止”，句子一般使用完成时，具体的时态需要根据by引导的时间状语来确定。本句中By引导的时间状语表示将来的时间，因此句子需要使用将来完成时，故确定答案为D)。

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