某人未能做某事，英语通常的表达是...to fali to do sth；当其中的fail名词化为failure时，其后的to do sth不变。
答：A. fail to do sth , 名词化后为failure to do sth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>>
