It’s _ hard problem for the twins that of t

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It’s _________ hard problem for the twins that ________ of them can work it out.
A.so;neither
B.such a;neither
答案为什么是B,A为什么不可以呢?
so...that不是连用吗?

hard problem 是名词词组,不可被so 副词修饰,
so 得修饰形容词,或者副词.或许你以为 hard 是形容词,为什么不选so?这里要注意hard 不是中心词,它是修饰名词problem 的.
so...that.这个结构是有,但前提是如果用so,so 后面的中心词要是形容词,副词
不懂追问*^__^*

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