the Vikings are believed( )America.a.in discovering b.to dis

问题描述:

the Vikings are believed( )America.a.in discovering b.to discover c.to have discovered
1个回答 分类:英语 2014-12-16

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C
◎believe可以用于被动语态.they are believed to have discussed this problem.据说,这个他们已经讨论过了.
 
 
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