As a teacher, I seldom give my students so difficult a problem_______ they can’t work out.
A．thatB．a(chǎn)sC．ifD．in order that
B

試題分析：句意：做為一名老師，我很少給學(xué)生他們做不出的很難的問題。這里是定語從句，先行詞是so difficult a problem，定語從句中缺少賓語，如果先行詞被as，so，the same修飾的話，用as引導(dǎo)定語從句，而且as在定語從句中做主賓表，選B。
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