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

A.thatB.asC.ifD.in order that

B

解析试题分析: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。
考点:考查定语从句

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