But at which stage language becomes a necessity has come under debate
个人理解是一个复合句里面由一个时间状语从句+一个宾语从句构成,这样理解对吗?
But at which stage language becomes a necessity has come under debate.
at which stage language becomes a necessity 这是名词性疑问分句作主语。特殊疑问句为 At which stage does language become a necessity? 一个特殊疑问句去问号、去倒装,就成为一个名词性从句,可以作名词性成分。本句中疑问分句作主语,后接谓语部分has come under debate.
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