This problem is so difficult that nobody can work it out.(保持

This problem is so difficult that nobody can work it out.(保持 This problem is so difficult that nobody can work it out. This problem is so difficult that we can't work it out.(保持句意 The problem is so difficult that nobody can work it out(改为同义 同义句 The math problem is so difficult that nobody can work it The problem is so hard that almost nobody can work it out为什么 He is so w____ that he can work out this difficult problem e 1.The math problem is so difficult that I can't work it out. The problem is so difficult that I can't work it out.同义句 请问这个句子：The problem is too difficult.Nobody can work out it.有 按要求改写句子 The problem is difficult .Nobody can work it out.（二句 This is so difficult a problem as no one can work out.as能不能换