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定语从句,it'ssodifficultaproblemnoonecanworkoutit'ssodifficultaproblemnoonecanworkitout.两题答案是什么,区别是什么

题目详情
定语从句,
it's so difficult a problem _no one can work out
it's so difficult a problem _no one can work it out.
两题答案是什么,区别是什么
▼优质解答
答案和解析
1\ that,或者which或者不填
2、 that且必须填.