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He _____English for eight years by the time he graduates fro

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He _____English for eight years by the time he graduates from the university next year.
A.will learn B.will be learning C.will have learn D.will have been learnt
我的答案是选C,可是参考答案是D,到底应该是哪一选项,
如果你的选项没有输错的话,则本题无答案.
本题正确答案应是:will have learned / learnt