By the time I graduate from university, I______ (be) a student for 15 years.

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问题 By the time I graduate from university, I______ (be) a student for 15 years.

选项

答案will have been

解析 by the time接将来时间或一般现在时的句子,表示将来预计完成的动作,主句要用将来完成时。
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