一道与so...that...
问题描述：
一道与so...that...
It was___difficult a problem ___ none of us worked it out.
答案是so,that.为什么不是such,that呢?请说明理由.
答
so+形容词+名词+that+句子；
such +a/an+形容词+名词+that+句子；
如果是such；应该是such a difficult problem+句子；
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