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)的時候哥哥回來了。根據(jù)語境,這里表示的是一個過去某一時刻正在進(jìn)行或發(fā)生的動作,應(yīng)用過去進(jìn)行時。故應(yīng)選C。
考點(diǎn):考查過去進(jìn)行時。

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