问题
选择题
The math problem was _________ difficult __________ none of us worked it out.
A.very; that
B.too; to
C.so; that
D.enough; that
答案
答案:C
题目分析:句意:这道数学题太难了以至于我们中谁也做不出来。so...that...如此……以至于……;too...to...太……而不能,to后接动词。故选C.