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
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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
