【題目】We cannot figure out _______ quite a number of insects, birds, and animals are dying out.

A. thatB. as

C. whyD. when

【答案】C

【解析】

考查賓語從句。figure out 是不及物動詞加副詞構(gòu)成的動詞短語后須跟賓語或賓語從句。句意為:我們搞不明白,為什么那么多的昆蟲、鳥類、動物正在滅絕。故選C。

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