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We cannot figure out ____quite a number of insects, birds, and animals are dying out.

A.     that  B. as  C. why  D. when

C


解析:

:figure out=understand by thinking. 理解。从句意看我不明白大量物种正在消亡,缺少状语,排除A、B项。从are dying out的时态排除D项,应该是我不明白大量物种为什么正在消亡。

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