问题
选择题
As a teacher, I seldom give my students so difficult a problem ________ they can not work out.
A.that
B.if
C.in order that
D.as
答案
答案:D
As a teacher, I seldom give my students so difficult a problem ________ they can not work out.
A.that
B.if
C.in order that
D.as
答案:D