Asateacher,Iseldomgivemystudents

发布时间：2020-07-10 00:41:43

As a teacher, I seldom give my students so difficult a problem ________ they can not work out．













A.that












B.if











C.in order that











D.as

网友回答

D解析as引导定语从句。关系代词as在从句中作主语或宾语。如果选A项that引导的是状语从句，状语从句中that不作成分所以句子应是“that they can not work it out”
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