.Three-fourths of the surface of the earth_________sea.
A．isB．a(chǎn)reC．wereD．has been
A
本題的含義是地球表面的四分之三是海洋，表示的是一個(gè)客觀的事實(shí)用一般現(xiàn)在時(shí)，本題的主語(yǔ)為不可數(shù)名詞，故用is，故本題選A。
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