问题标题:
【Threemillonchildrenunder15areestimated________AIDSacrosstheworldinthepast20years.A.catchingB.havingcaughtC.tocatchD.tohavecaught】
问题描述:

Threemillonchildrenunder15areestimated________AIDSacrosstheworldinthepast20years.A.catchingB.havingcaughtC.tocatchD.tohavecaught

邵亚男回答:
  D在过去的二十年已经感染了艾滋病,用现在完成时
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