My brother came back home while I           homework.
A．a(chǎn)m doingB．did
C．was doingD．were doing
C

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。
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