of the land in that district covered with trees and grass.A. Two fifth; isB. Two fifth;

of the land in that district covered with trees and grass.
A. Two fifth; is
B. Two fifth; are
C. Two fifths; is
D. Two fifths; are

A. Two fifth; isB. Two fifth; are(答案→)C. Two fifths; isD. Two fifths; are解析：句意：那个地区的三分之二的土地都覆盖有绿树和青草。分数的表达法：分子用基数词，分母要用序数词，当分子大于一时，分母要用复数，故排除A&B；又由当分数作主语时，句子的谓语动词要与分数后的名词保持一致，句中land为单数，故谓语动词应为is,故答案选C。

就是这个解释