- When did the computer crash?- This morning, while I ______ the reading materials downloaded from some websites.[ ]A. have sorted B. was sortingC. am sorti-高中英语-魔方格

◎ 题干

- When did the computer crash?
- This morning, while I ______ the reading materials downloaded from some websites.

[ ]

A. have sorted
B. was sorting
C. am sorting
D. had sorted

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◎ 解析

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◎ 知识点

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