Three-fourths of the surface of the earth＿＿＿seaA. isB. areC. wereD. has been

问题补充：

Three-fourths of the surface of the earth＿＿＿sea．

A. is

B. are

C. were

D. has been

答案：

(答案→)A. is

B. are

C. were

D. has been

解析：分数修饰主语时，若主语为不可数名词，谓语用单数形式；若主语为可数名词，谓语通常用复数形式。