The Vikings are believed______America.

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问题 The Vikings are believed______America.

选项 A、to have discovered
B、to discover
C、in discovering
D、to have been discovered

答案A

解析 词组be believed to do sth.意为“人们认为……或人们相信……”,另discover America不是被动,且句中是几经发现的意思。
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