【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】

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

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