一道简简单单的英语语法题目

Question

Such a comment on Jerry,whom we know ___ so kind and thoughtful , is unfair.
答案是to be
其他选项有as , being, for
不知道为什么选to be 感觉奇奇怪怪的

Answer 1

to be so kind and thoughtful,不定式做宾补。把倒装正过来比较好理解：
we know him to be so kind and thoughtful.
用as，being，for 好像意思都有偏差。

Answer 2

should be "is"

Answer 3

语感

Answer 4

读着顺