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you look very(选择)

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-----you look very puzzled ,what is happening? -----our teacher has assigned us such a difficult math problem_____we can not work out. A as B which Cthat D because thank you
you look very(选择)
解题思路: 如下
解题过程:
选A正确。
 such...as用于引导定语从句,such...that 用于引导结果状语从句。如:
  I’ve never heard such stories as he tells. 我从未听过他讲那样的故事。
  It was such a cold day that there was nobody on the street. 天气很冷,街上没有一个人。
  试比较:
  He is such a good teacher as we all respect. 他是一位我们大家都尊敬的好老师。(as引导的是定语从句,as 在该定语从句中用作respect的宾语)
  He is such a good teacher that we all respect him. 他是那样一位好老师,以致于我们大家都尊敬他。(that 引导的是结果状语从句,that在该状语从句中不充当句子成分,另外注意句中的respect带有宾语him)
根据句意应该选A,因为从句中work out 后面没有宾语。可知是定语从句,先行词math problem做定语从句的宾语。
最终答案:略