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—Whyareyousopopularwithyourstudents?—Asateacher,Iseldomgivemystudentssodifficultaproblemtheycannotworkout.A.asB.thatC.ifD.which

题目详情

— 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.as B.that C.if D.which
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答案和解析
A

考查定语从句。先行词为a problem,后面的从句they cannot work out后缺少宾语,所以使用关系代词,so… as,为固定搭配,所以选A。