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.
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.
问题解答：
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