How about my food?I___here for almost half an hour.A.have been sitting B.am sittingC.had been sitting D.was sitting

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Howaboutmyfood?I___hereforalmosthalfanhour.A.havebeensittingB.amsittingC.hadbeensittingD.wassittingH

How about my food?I___here for almost half an hour.A.have been sitting B.am sittingC.had been sitting D.was sitting
How about my food?I___here for almost half an hour.A.have been sitting B.am sitting
C.had been sitting D.was sitting

How about my food?I___here for almost half an hour.A.have been sitting B.am sittingC.had been sitting D.was sitting
选择A 首先for加一段时间要用完成时,排除BD,过去完成时必须要有一个过去的时间为基准,过去的过去才可用过去完成时,这里没有过去时间,排除C~