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  3. We can’t figure out________quite a number of insects, birds, and other animals are nearly dying out.

We can’t figure out________quite a number of insects, birds, and other animals are nearly dying out.

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问题 We can’t figure out________quite a number of insects, birds, and other animals are nearly dying out.
选项 A、that
B、as
C、why
D、for which
答案C
解析 分析句子结构并结合句意可知，空处引导的是宾语从句，在从句中作原因状语，所以应用why来引导。故选C。
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