The Viking are believed _______America.

问题描述:

The Viking are believed _______America.
A.to have discovered B.to discover
C.in discovering D.to have been discovered
应该选择哪一个啊?为什么?

A.to have discovered
sb be believed to have done sth ,人们相信某人已经做某事
【俊狼猎英】团队