【題目】A large quantity of water _________ polluted in the past twenty years across China.

A.isB.areC.has beenD.have been

【答案】C

【解析】

考查時(shí)態(tài)和主謂一致。句意：在過(guò)去的二十年中，中國(guó)各地大量的水被污染�！�a great/large quantity of+名詞”作主語(yǔ)時(shí)，其謂語(yǔ)的數(shù)取決于 quantity的數(shù)，謂語(yǔ)動(dòng)詞用單數(shù)；時(shí)間狀語(yǔ)in the past twenty years和現(xiàn)在完成時(shí)連用，因此此處用has been done形式。故選C項(xiàng)。

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