Large quantities of water______for irrigation.

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问题 Large quantities of water______for irrigation.

选项 A、is needed
B、have needed
C、are needed
D、need

答案C

解析 a large quantity of可修饰可数名词或不可数名词,整个短语作主语时,谓语动词的单复数由其中的名词决定,但quantities of无论修饰可数还是不可数名词,谓语都用复数形式。另外,本句要用被动语态。
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