摘要： We can’t figure out quite a number of insects.birds.and animals are dying out. 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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