一道英语选择题_be thought to be的用法

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一道英语选择题_be thought to be的用法
____more than 3000 languages in the world.
A.There are thought to be
B.There is thought to be
C.They are thought to be
D.It is thought to be
There is thought to be和It is thought to be这两种说法是否都存在?在什么情况下用?
.总感觉怪怪的

首先答案D肯定不行在这个句子中thought to be 后面应该跟形容词或形容词性短语.跟名词的话总让人觉得别扭.不合英语习惯.
习惯性用法是It is thought to be +adj that...
A是有点怪,我看可以接受的理解只有这一种:把原句的主干看成There are more than 3000 languages in the world.而thought to be 作插入语,起解释说明的作用.

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