Land animals are believed ______ from sea animals.
A．to have developedB．to have been developed
C．having developedD．having been developed
A
考查非謂語動(dòng)詞。句意：陸地動(dòng)物被認(rèn)為是由海洋動(dòng)物進(jìn)化而來的。根據(jù)句意可知事情已經(jīng)發(fā)生，故用不定式的完成時(shí)，選A。
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