Farming,_____to human welfare,is now a small part of the economy _英语解答

Farming,_____to human welfare,is now a small part of the economy of the country.A.essential as it is B.essential as is C.it is essential D.as essential

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解答

选A 形容词短语作定语
be essential to ---- 对----很必要的 as it is 事实上
.