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

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

【答案】D

【解析】

試題分析:考查賓語從句。句意:研究人員已經(jīng)發(fā)現(xiàn)了他們所認(rèn)為的新物種。discovered后跟一個(gè)賓語從句,believe后面缺少賓語,在名詞性從句中,作主語、賓語或表語用what,故選D。

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