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
问题描述：
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
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
.