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The researchers have discovered __________they believe to be a new species.

A. which B. who C. where D. what

D

【解析】

试题分析:考查宾语从句。句意:研究人员已经发现了他们所认为的新物种。discovered后跟一个宾语从句,believe后面缺少宾语,在名词性从句中,作主语、宾语或表语用what,故选D。

考点:考查宾语从句

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