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

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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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