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Eelectriccarwouldbebothquieterandcleanertouse中bothquieterandcleaner和touse作什么成分

题目详情
Eelectric car would be both quieter and cleaner to use中both quieter and cleaner和to use 作什么成分
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答案和解析
both quieter and cleaner作并列表语,句子主干是主系表结构,形容词比较级作表语
to use为动词不定式作补足语,修饰Eelectric car