【題目】My brother came back home while I homework.
A.am doing
B.did
C.was doing
D.were doing

【答案】C
【解析】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,這里表示的是一過(guò)去動(dòng)作發(fā)生在某一正在進(jìn)行的動(dòng)作當(dāng)中,那么這個(gè)正在進(jìn)行的動(dòng)作用過(guò)去進(jìn)行時(shí)。主語(yǔ)為單數(shù),故應(yīng)選C。

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