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

試題分析：句意：你的電腦何時(shí)出了問(wèn)題？昨晚，當(dāng)我從網(wǎng)站上下載音樂(lè)時(shí)。表示過(guò)去某一時(shí)刻正在發(fā)生的動(dòng)作用過(guò)去進(jìn)行時(shí)態(tài)，所以選C。
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