This is a difficult problem(A),but not(B) too difficult problem(C) for them to solve(D)改错题.只有1个错误,

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This is a difficult problem(A),but not(B) too difficult problem(C) for them to solve(D)
改错题.只有1个错误,

C too difficult problem------too difficult a problem
so/too+形容词+a/an+单数名词

not(B)——not a

C错
去掉 problem
too+形容词或副词+ for sb. to do(sth)
对于某人来说太。。。以至于不能。。。。
或者前面加个 a
不过要是这么改的话,problem在句中出现两次,难免显得不利索。
供参考,祝进步!

直接把C处的problem删掉,读着都别扭

选C,把problem去掉
Sth is +adj.+for sb. to do做某事对某人来说很....
这是一个难题,但并不是难到他们无法解决