______of the water_____polluted. We must try to protect our environment.

A．Two third; areB．Two third ; is
C．Two thirds; areD．Two thirds ; is

D

解析試題分析：句意：三分之二的水被污染了，我們必須保護(hù)我們的環(huán)境。分?jǐn)?shù)的表示是：分子用基數(shù)詞，分母用序數(shù)詞；分子超過(guò)一，分母要用復(fù)數(shù)形式。Water做主語(yǔ)，謂語(yǔ)動(dòng)詞用單數(shù)。故選D。
考點(diǎn)：考查分?jǐn)?shù)和主謂一致。

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