As a teacher I seldom give my students so difficult a problem they can’t work out.A. that

问题补充：

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：

A. that

(答案→)B. as

C. if

D. in order that

解析：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。