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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
【考點】本題考查時態(tài)的用法
首先根據時間狀語this morning知道是發(fā)生過的事情，去除A、C兩項，然后過去完成時的使用前提是有動作的先后順序，然而本句指的是“今天早晨我正把從網上下載的閱讀材料分類時電腦壞的。”指的是過去正在進行的動作用過去進行時，B項正確。
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