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    精英家教网 > 高中英语 > 题目详情
    By the time he retires, professor Baker _____ for almost forty years．
    A．will have taughtB．had taught
    C．has taughtD．is teaching
    ：A
    ：考查时态。By与完成时连用，by后面的时间状语从句用一般现在时代替将来时，所以主句中用将来完成时。句意：等到他退休的时候，Baker教授将已经教了40年的书了。故A正确。
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