【题目】What he said was ________ difficult for us ________ understand.
A. so; that B. enough; to C. too; to D. such; that
【答案】C
【解析】句意:他所说的话对于我们来说是太难而不能理解。So+形容词或词+that从句,表示如此……以至于……;形容词或副词+enough…to….表示做……足够……;too+形容词或副词+to do sth.表示太……而不能……;such +a/an+形容词或词+名词+that从句,表示如此一个……以至于……。根据汉语提示,故选C。