With plant species_______at an alarming rate,scientists are creating a global network of plant banks to store seeds.

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问题 With plant species_______at an alarming rate,scientists are creating a global network of plant banks to store seeds.

选项 A、disappeared
B、to disappear
C、disappearing
D、disappear

答案C

解析 考查非谓语动词。句意:因为植物物种在以极快的速度消失,科学家正着手建立一个植物银行全球网络系统以储藏种子。disappear与plant,species之间是主动关系,且该动作正在进行,所以应该使用其现在分词形式作with的宾语补足语,故选C。
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