Once employed,Simon____to Africa to do the market research.A.is sent B.has been sentC.was sent D.will be sent为什么不能选C?
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![Once employed,Simon____to Africa to do the market research.A.is sent B.has been sentC.was sent D.will be sent为什么不能选C?](/uploads/image/z/9814717-37-7.jpg?t=Once+employed%2CSimon____to+Africa+to+do+the+market+research.A.is+sent+B.has+been+sentC.was+sent+D.will+be+sent%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E8%83%BD%E9%80%89C%3F)
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