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We cannot figure out quite a number of insects, birds, and animals are dying out

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We cannot figure out quite a number of insects, birds, and animals are dying out

We cannot figure out ________ quite a number of insects, birds, and animals are dying out.

[]

A．that　B．as

C．why　D．when

试题答案

答案：C

标签：numberquiteinsectsofcannot

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