By the end of this year, he ________ in this factory for as many as thirty years.

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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 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，故选D。

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大学英语三级A级

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