__________ that these creatures are linked to a common ancestor.
A．As is believedB．What is believed
C．That is believedD．It is believed
D

試題分析：考查句型：It is believed that…，據(jù)相信…,it 是形式主語，that引導的是真正的主語，句意：據(jù)相信這些生物和一個共同的祖先有聯(lián)系。選D。
點評：It is believed that…，據(jù)相信…這個句型可以改寫成：Sb/sth is said to do句型，要學會互相轉(zhuǎn)化，而且過去分詞除了believed，還有said，thought，suggested等。
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