As a teacher, I seldom give my students so difficult a problem_______ they can’t

题干

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

上一题下一题 0.64难度单项选择更新时间:2017-02-07 04:31:42

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