Three-fourths of the surface of the earth＿＿＿sea．
A．is B．a(chǎn)re C．were D．has been
A
分?jǐn)?shù)修飾主語時(shí)，若主語為不可數(shù)名詞，謂語用單數(shù)形式；若主語為可數(shù)名詞，謂語通常用復(fù)數(shù)形式。
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