yet 句首的副词 作状语
the human instrumentalities做主语
working just as they do现代分词做伴随状语
are of the best adaptation to effect his purpose 系动词are表明这后面的是表语 of+名词或名词结构可以当作是形容词 the best adaptationto effect his purpose 就是个名词结构
working just as they do 现代分词做伴随状语