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    精英家教网 > 高中英语 > 题目详情
    一 When did the computer crash?
    一 This morning, while I   the reading materials downloaded from some websites.
    A．have sortedB．was sortingC．am sortingD．had sorted
    B
    【考点】本题考查时态的用法
    首先根据时间状语this morning知道是发生过的事情，去除A、C两项，然后过去完成时的使用前提是有动作的先后顺序，然而本句指的是“今天早晨我正把从网上下载的阅读材料分类时电脑坏的。”指的是过去正在进行的动作用过去进行时，B项正确。
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