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We wonder ___________ quite a number of living things are dying out.
A.thatB.asC.whyD.when
C

试题分析:考查宾语从句。句意:我想知道为什么有如此多的生物灭绝。That在宾语从句中不能充当任何成分,之前连接作用;as不能引导宾语从句。When的意思不搭配。故C正确。
点评:宾语常考的考查主要是考查陈述语序和连词的词义辨析。
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