By the time he was sixty,he _for the company forthirty years.为什么答案是will have worked

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By the time he was sixty,he _for the company forthirty years.为什么答案是will have worked
By the time he was sixty,he _for the company for
thirty years.为什么答案是will have worked

By the time he was sixty,he _for the company forthirty years.为什么答案是will have worked
by the time …当……的时候,……
通常引导一个时间状语从句,表示“到……的时候”主句则表示在此时间之前某个事件已完成.注意,当从句用过去时时,主句通常用过去完成时.
by the time 加过去时间词,后用过去完成时.加将来时间词,后用将来完成时.
By the time he was sixty,he will have worked for the company for thirty years.
意思是,当他六十岁的时候,他就已经为公司工作了三十年了.
由于还没有到六十岁（这里只是做出一个假设）,所以用了“will”

had worked

这是将来完成时，表示到将来的某个时间点，已经完成的事情或造成的影响。
全句的意思是：到他六十岁的时候（现在他只有30岁），他将已经为这个公司工作30年了。
题目中was应该改成is。这样就对了。

您好！很高兴为您解答！
翻译：到他30岁的时候，他已经是为公司工作了30年。by the time"到。。。。时候”，其后加过去时间词，后用过去完成时。加将来时间词，后用将来完成时。根据其后跟的时间来定

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答案应该是 would have worked；在他60岁前，他已经为公司工作了30年了。
would have done 过去将来完成时

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