Mr.Black is a worker of No.1 Machine Factory.She___three since it opened in 1958.A.worked B.worksC.has worked D.is working

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Mr.Black is a worker of No.1 Machine Factory.She___three since it opened in 1958.A.worked B.works
C.has worked D.is working

选C ,因为他三年的工作已经在过去完成了,是过去完成式!