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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意为“弄清楚”,后接疑问词引导的宾语从句。句意为“我们搞不清楚为什么大量昆虫、鸟类和动物正在渐渐消亡”。

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