The American artist James Abbott McNeill Whistler promoted the idea of art for art's sake,insisting that painting__no mission to fulfill.答案是had.但我认为用虚拟语气(should) have.???不对吗？请指教．
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你为什么要用虚拟语气阿？ 因为for one's sake吗？for one's sake后面是不需要用虚拟语气的。另外，insisting that...是个状语从句，时态应和前面一致。