英语语法：so that 和 too to 的区别

题目

英语语法：so that 和 too to 的区别
This problem is ______ difficult ________.
A.so,that few of us can answer.
B.so,that few of us can answer it.
C.too,for anyone of us can answer it.
D.too,for anyone of us to answer it.
要有详细的解析.

答案

B
so... that...(如此...以至...):that后加从句
too...to...(太...而不能...):to后加短语或动词原形,不能加句子
D应该为to answer,去掉it,因为to后加动词原形,且answer it不是短语