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Large quantities of water ________ for cooling purpose in the only one of the plants that ________ steel in the city.

A.has been needed; produce

B.are needed; produces

C.is needed; produces

D.have been needed;produce

答案:B解析:考查时态和主谓一致。语意:这个城市唯一生产钢材的工厂需要大量的水用于冷却。第一空,谓语动词应与quantities一致,由于陈述的是目前的状况,因此,要用一般现在时,即are needed。第二空,定语从句的谓语动词应与the only one保持一致。

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