【題目】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

【答案】B

【解析】

考查時態(tài)。句意：——計算機是什么時候崩潰的?——今天早上，當我從一些網(wǎng)站下載閱讀材料的時候。首先根據(jù)時間狀語this morning知道是發(fā)生過的事情，去除A、C兩項，然而本句指的是“過去正在進行的動作”，所以用過去進行時，B項正確。

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