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    The maths problem is too difficult for him to work out. The maths problem is difficult he work it out. 【查看更多】

     

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    按要求转换下列句型，每空限填一词。

    The maths problem is too difficult for him to work out. (改为复合句)

    The maths problem is ________ difficult ________ he can't work it out.

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