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    精英家教网 > 高中英语 > 题目详情
    Allen has decided that he will be an engineer by the time he ________ twenty.
    A．had beenB．is going to be
    C．will beD．is
    D
    答案：D　考查考生对题干和动词时态的理解及掌握情况。句中by the time相当于when，用来引出时间状语从句，从句中需用一般现在时表将来，故选D。
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