of the land in that districtcovered with trees and grass.A. Two fifth;isB. Two fifth;areC.

问题补充：

of the land in that districtcovered with trees and grass.

A. Two fifth;is

B. Two fifth;are

C. Two fifths;is

D. Two fifths;are

答案：

A. Two fifth;is

B. Two fifth;are

(答案→)C. Two fifths;is

D. Two fifths;are

解析：分数的分子用基数词，分母用序数表示。如果分子大于1，序数词后加s。分数和百分比作主语时，谓语动词的形取决于分数和百分比后的名词。句子中的主语land是单数，谓语动词要用is covered。