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

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问题 We can’t figure out______quite a number of insects, birds, and animals are dying out.

选项 A、that
B、as
C、why
D、when

答案C

解析 本题考查引导宾语从句的引导词。根据关键词are dying out可排除as,when两项。figure out有“理解,想出;计算”等意。根据句意应选why。
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