Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.A.disappearedB.disappearingC.disappearD.having disappeared
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B解析考察非谓语动词用法。Rare species与disappear构成主动关系，所以使用现在分词。D项是完成式，本句没有体现出已经完成，故B正确。