working hard,我想句子可能是现在进行时态，例如I am working hard to through the examination,也可以是现在分词作主语，hard 修饰working ，如If working hard ,you will get a better grades,意思是“努力的工作”，而hard working是现在分词作名词使用，hard为形容词，修饰working ,意思是“艰难的工作”
答：______seems very hard _____this problem in an hour D.It;to work out详情>>
答：I haven't window molding catalogs on hand. catalogs 产品目录 haven't ~ something ~ o...详情>>
问：working hard vs. hard working
答：there are no defferent.详情>>
