Ninety-six point five percent of the water on the earth ______ sea water.
A．a(chǎn)reB．isC．wasD．were
B
考查主謂語一致性。百分?jǐn)?shù)和分?jǐn)?shù)做主語要依據(jù)它們后面接的詞而定，是名詞復(fù)數(shù)形式的用復(fù)數(shù)謂語動詞；反之用單數(shù)謂語動詞。此處water為不可數(shù)名詞，為一般事實，故選B符合。
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