摘要： Large quantities of water for irrigation. A. is needed B. has needed C. are needed D. need [解析]选C.句意: 灌溉需要大量的水.a quantity of/quantities of无论修饰不可数名词还是修饰可数名词复数, 作主语时, 谓语动词取决于quantity的数.large quantities为复数, 谓语动词用复数,且water与need之间为动宾关系, 用被动语态.因此选C.

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