题目内容


.Three-fourths of the surface of the earth_________sea.
A．isB．areC．wereD．has been
A
本题的含义是地球表面的四分之三是海洋，表示的是一个客观的事实用一般现在时，本题的主语为不可数名词，故用is，故本题选A。
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