He felt frustrated when he found （） impossible to catch up with heis classmatensclassmatesA itB it is我感觉都可以啊?B为何不可？

选A
固定表达。

这道题是考查it 作为形式宾语的。
1.宾语是不定词或名词字句时，须用形式宾语(it)，写成V+it+形容词+ 不定词或名词子句.比如说:
He made it clear what he intended to do.
I take it for granted that you will give me a hand.
They feel it necessary to work harder.
在以上句子中,真正的宾语都不是it,而是句子的后半部分.
2.你所提到的问题是关于 find it +adj 这一习惯用法问题，由于习惯用法，比你想说：
I think it is difficult for me to explain this to you.
就可以直接说成
I think it difficult for me to explain this to you.
8

A
固定用法 find it +形容词

A
find it + adj.固定用法

1.答案：A.2.翻译：当他发现不可能赶上他的同班同学们时,他感到很沮丧.3.1）答案A为典型的“及物动词find + 形式宾语it + 宾语补足语impossible + 真正宾语to catch...”结构.有上述结构的动词一般有如下五个：find/...

it is possible to do sth一般都这么用

found it impossible to catch up with his classmates
or
found that it is impossible (for him) to catch up with his classmates