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?

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

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 .