this is such a difficult problem that few students can work it out同义句转换this is ____ _____ ______ problem the few students can work it out

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this is such a difficult problem that few students can work it out同义句转换this is ____ _____ ______ problem the few students can work it out
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this is such a difficult problem that few students can work it out同义句转换this is ____ _____ ______ problem the few students can work it out
this is such a difficult problem that few students can work it out同义句转换
this is ____ _____ ______ problem the few students can work it out

this is such a difficult problem that few students can work it out同义句转换this is ____ _____ ______ problem the few students can work it out
so difficult a

so difficult a