This problem is too difficult for us to ____A.to work ot out B.to work out

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This problem is too difficult for us to ____A.to work ot out B.to work out
This problem is too difficult for us to ____
A.to work ot out
B.to work out

This problem is too difficult for us to ____A.to work ot out B.to work out
B正确,主语this problem在意义上是work out 的宾语,因此后面的it就没必要带了

选B this problem 作 to work out 的宾语

b

选B too+adj/adv to+v(原型)A项 是个表语从句了故不选。