We cannot figure out ____quite a number of insects, birds, and animals are dying out.
A．thatB．a(chǎn)sC．whyD．when
C
：figure out="understand" by thinking. 理解。從句意看我不明白大量物種正在消亡，缺少狀語，排除A、B項(xiàng)。從are dying out的時(shí)態(tài)排除D項(xiàng)，應(yīng)該是我不明白大量物種為什么正在消亡。
【標(biāo)簽】名詞性從句連接詞
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