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
B
考察非謂語動(dòng)詞用法。Rare species與disappear構(gòu)成主動(dòng)關(guān)系，所以使用現(xiàn)在分詞。D項(xiàng)是完成式，本句沒有體現(xiàn)出已經(jīng)完成，故B正確。
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