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    精英家教网 > 高中英语 > 题目详情
    By the time a child is five, he _______ hundreds of hours of television.
    A．will watchB．will have watchedC．had watchedD．is watching
    B
    在时间状语从句中By the time+ 一般现在时态，表示的是将来，主句应用将来完成时态，句意：到一个孩子五岁的时候，他将会已经看了几百个小时的电视了。所以选B。
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