题目内容

—When did the computer crash?
—This morning，while I ________ the reading materials downloaded from some websites.(2012·福建)
A．have sortedB．was sorting
C．am sortingD．had sorted
B
考查动词的时态。句意：——电脑什么时候死机的？——今天上午，当我正在把从一些网站上下载下来的阅读材料进行分类的时候。根据句意可知，死机发生在我正在做某事时，也就是在过去的某个时间点，我正在做某事，故应用过去进行时态。
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