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Threemillonchildrenunder15areestimatedAIDSacrosstheworldinthepast20years.A.catchingB.havingcaughtC.tocatchD.tohavecaught

题目详情
Three millon children under 15 are estimated ________AIDS across theworld in the past 20 years.A.catching B.having caught C.to catch D.to have caught
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答案和解析
D 在过去的二十年已经感染了艾滋病,用现在完成时