—When did the computer crash?— This morning, while I ______ the reading materials downloaded from some websites. [ ]A. have sortedB. was sortingC. am sortin-高中英语-n多题

◎ 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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