He will have learned English for eight years by the time he_

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He will have learned English for eight years by the time he___from the university next year.
A will graduate B will have graduated C graduates D is to graduate
为什么这道题选的是C?求具体解释.

固定用法,主将从现（即主句用将来时,从句用现在时）
即使从句说的也是将来的事,也用一般现在时来叙述.
再问：话说主将从现怎么看？
再答：主将从现的用法比较常见，常用于时间状语从句和条件状语从句中。这种情况下，如果主句是一般将来时，从句用一般现在时替代一般将来时。你这里就是典型的时间状语从句。

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