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—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

试题分析:考查时态。句意:——Tom完成了他的任务吗?——我不确定。但是他上周一直致力于这个任务。根据语境,说明与过去有关,且表示过去一段时间(last week)内一直在做某事,故使用过去进行时。
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