By the end of this year, Mr. Brown ______ (be) here for twenty years.

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问题 By the end of this year, Mr. Brown ______ (be) here for twenty years.

选项

答案will have been

解析将来完成式。此句存在一个表示将来完成时的时间状语 by the end of this year，所以此句谓语用将来完成式。将来完成式表示将来某一时间或另一个将来的动作之前，已经完成的动作或已获得的经验。[例句] He will have graduated by then．到那时他就已经毕业了。

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