题目内容

We cannot figure out ____quite a number of insects, birds, and animals are dying out.
A．thatB．asC．whyD．when
C
：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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