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题目
题型:不详难度:来源:
Land animals are believed ______ from sea animals.
A.to have developedB.to have been developed
C.having developedD.having been developed

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。
核心考点
试题【Land animals are believed ______ from sea animals.A.to have developedB.to have b】;主要考察你对一般现在时等知识点的理解。[详细]
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