Question

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．disappeared

B．disappearing

C．disappear

D．having disappeared

Answer 1

B

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。