Mary has tried Beijing roast duck.(变为现在完成时的否定句)

Mary has tried Beijing roast duck.(变为现在完成时的否定句) Finally Mary was admitted by Beijing University,for which she 9（?）five timesA.had triedB.watrying C.has tried D.tried Finally Mary was admitted by Beijing University, for which she ___ five times.选择题?Finally Mary was admitted by Beijing University, for which she ___ five times.A:had tried B:was trying C:has tried D:tried答案是A , D 为什么是错 Mary has some friends mary has ( ) aunt every possible means_____.A.has tried B.has been tried C.was tried D.were tried为什么选B Every means has been tried since More than one means has been tried. 四道英语题,说明理由1If this coat isnt yours,----can it be?Awho else Bwhich else Cwho else‘s2----rapid progress Mary has made in the examAwhat a Bwhat Chow3Every means----been tried ever since Bill has finished his homework____A.So does Mary B.So is Mary C.So has Mary D.So Mary has Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.选哪个,为什么? 7.All possible means __________ to save the hero.A.has tried B.have tried C.has been tried D.have been tried Mary's being chose中的Mary's是Mary has 还是Mary is She has a friend _____(call)Mary Has Mary any story-books?什么意思 mary has some books变否定句 Mary has a TV(改为否定句) Who_(have) a bicycle Mary has.