题目

______ 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 答案：C 解析: “the number of” 表示“……的数量”，谓语用单数；“a number of”表示“许多”，谓语用复数。

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