The problem was too difficult to be solved还是The problem was too difficult to solve?

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The problem was too difficult to be solved还是The problem was too difficult to solve?

用后面的.be 动词后面的形容词如果是easy/difficult等的话,动词不定式只要用主动的.

是The problem was too difficult to be solved
因为问题只能被解决,而不能自己解决,希望能对你有所帮助!

It's too difficult to solve the problem .