问题
选择题
As a teacher, I seldom give my students so difficult a problem_______ they can’t work out.
A．that
B．as
C．if
D．in order that
答案
答案：B
题目分析：句意：做为一名老师，我很少给学生他们做不出的很难的问题。这里是定语从句，先行词是so difficult a problem，定语从句中缺少宾语，如果先行词被as，so，the same修饰的话，用as引导定语从句，而且as在定语从句中做主宾表，选B。