(2008-04-07 18:46)-
Many kinds of animals are believed___from the earth.A.disappearing B. to disappeared C.having disappeared D.to have disappeared为什么不限B呢？
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Teacher3：这个我还真没印象了，你可以举个例子我再看看，不过倒是有些不定式在被动的时候需要增加to如 They made me repeat the whole story. She must be made to comply with the rules.(2008-04-06 11:09)
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yulinlin：不是有些动词不定式被动后省to吗，这里为什么不呢？(2008-04-05 19:42)
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Teacher3：答案应该是D， be believed to do sth,表示被认为做什么事，因为是已经消失，所以用完成时，B虽然用了不定式，但是怎么能在to后接过去分词呢(2008-04-05 01:35)
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wc20051039：答案是什么(2008-04-04 22:45)
