填入下面句子空格处的语句，最恰当的一组是（ ）专注痴迷于创造的沉酣而不作世故的权衡和功利的算计，是进入最佳创作状态和确保艺术神圣与纯洁的前提。前人早已发现：人， ﹔ 。艺术品格的滑坡往往是经不住非艺术的种种诱惑而造成艺术本身相对独立性的丧失。

The old man, _____ abroad for twenty years, is on the way back to his motherland. [ ]

In Britain people_______four million tons of potatoes every year.[ ]

It was not until the 18th century that manrealized that the whole of the brain was involved in the working of the mind，

He works much harder than I, so the money he has made is mine style=”width:500%;padding:0cm 0cm 0cm 0cm”