My brother came back home while I           homework.

A.a(chǎn)m doing B.did
C.was doing D.were doing

C

解析試題分析:句意為:我正在做作業(yè)的時(shí)候哥哥回來(lái)了。根據(jù)語(yǔ)境,這里表示的是一個(gè)過(guò)去某一時(shí)刻正在進(jìn)行或發(fā)生的動(dòng)作,應(yīng)用過(guò)去進(jìn)行時(shí)。故應(yīng)選C。
考點(diǎn):考查過(guò)去進(jìn)行時(shí)。

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