Question

-When did your computer go wrong?
-Last night, while I_______ some music from a website.

A．downloaded	B．am downloading
C．was downloading	D．have downloaded

Answer 1

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。