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【题目】When did the computer crash?

This morning, while I the reading materials downloaded from some websites.

A.have sortedB.was sortingC.am sortingD.had sorted

【答案】B

【解析】

考查时态。句意:——计算机是什么时候崩溃的?——今天早上,当我从一些网站下载阅读材料的时候。首先根据时间状语this morning知道是发生过的事情,去除AC两项,然而本句指的是“过去正在进行的动作”,所以用过去进行时,B项正确。

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