—Has Tom finished his task yet?
—I’m not sure. But he _____ on it last week
A．was workingB．has been working
C．workedD．had been working
A

試題分析：考查時(shí)態(tài)。句意：——Tom完成了他的任務(wù)嗎？——我不確定。但是他上周一直致力于這個(gè)任務(wù)。根據(jù)語(yǔ)境，說(shuō)明與過(guò)去有關(guān)，且表示過(guò)去一段時(shí)間（last week）內(nèi)一直在做某事，故使用過(guò)去進(jìn)行時(shí)。
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