-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:你的電腦何時出了問題?昨晚,當(dāng)我從網(wǎng)站上下載音樂時。表示過去某一時刻正在發(fā)生的動作用過去進(jìn)行時態(tài),所以選C。
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