AIDS is said ________ the number-one killer of both men and women over the past few years in that poverty-stricken region where no medical services are available．


  1. A.
    being
  2. B.
    to be
  3. C.
    to have been
  4. D.
    having been
C
解析：

試題分析：本題考查對非謂語動詞的掌握。詳細(xì)
解答：由句中的時間狀語“over the past few years”可知動作發(fā)生在謂語動作之前，故應(yīng)用不定式的完成式作賓語。
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