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.
问题描述:
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.
答
too for to
答
too for to
too...to...太.而不能.