the problems are so difficult,we cat`t work them out同意句怎么改?请迅速………………

题目

the problems are so difficult,we cat`t work them out同意句怎么改?请迅速………………
the problems are so difficult,we cat`t work them out同意句怎么改：the problems are too difficult ____ ____ _____work out.提示：不能写成the problems are too difficult to do them work out.

答案

the problems are too difficult __for__ __us__ __to___work out.
too...to 是太...而不能...的意思
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