This problem is so difficult that we can't work it out.(保持句意不变)This problem is ____ difficult ____ us _____ work out.

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This problem is so difficult that we can't work it out.(保持句意不变)This problem is ____ difficult ____ us _____ work out.
This problem is so difficult that we can't work it out.(保持句意不变)
This problem is ____ difficult ____ us _____ work out.

This problem is so difficult that we can't work it out.(保持句意不变)This problem is ____ difficult ____ us _____ work out.
too for to
too...to...太.而不能.

too for to