题目内容

-When did your computer go wrong?
-Last night, while I_______ some music from a website.
A．downloadedB．am downloading
C．was downloadingD．have downloaded
C

试题分析：句意：你的电脑何时出了问题？昨晚，当我从网站上下载音乐时。表示过去某一时刻正在发生的动作用过去进行时态，所以选C。
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