Rarespeciesintheworld,byhundre

更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 1072

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

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