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Mum,you really need to have a rest!You ________in the kitchen ever since you came back home three hours ago.
A.had workedB.were working
C.have been workingD.worked
C

句意为:妈妈你真的需要休息了!从你三小时前回到家里,你就一直在厨房干活。强调从过去开始的某一动作一直延续至今并仍在进行时,用现在完成进行时。
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