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

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.
英语人气:161 ℃时间:2019-08-20 13:15:20
优质解答
too for to
too...to...太.而不能.
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