Land animals are believed ______ from sea animals.A．to have developedB．to have b
题型：不详难度：来源：
Land animals are believed ______ from sea animals.| A．to have developed | B．to have been developed | | C．having developed | D．having been developed |
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答案
| A |
解析
| 考查非谓语动词。句意：陆地动物被认为是由海洋动物进化而来的。根据句意可知事情已经发生，故用不定式的完成时，选A。 |
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