— Why are you so popular with your students?
— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
A．a(chǎn)s B．that C．if D．which
A
考查定語從句。先行詞為a problem，后面的從句they cannot work out后缺少賓語，所以使用關(guān)系代詞，so… as，為固定搭配，所以選A。
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