1this means that a huge amount of water is used.为什么有a 不能直接 h

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/07/12 13:23:37

1this means that a huge amount of water is used.为什么有a 不能直接 huge amount.
2the gragh shows how the amount of water used worldwide changed.为什么是changed?而不是 was changed

1、a huge amount of有这个用法,可以算固定搭配了,记住就行,不用问为什么
2、这是时态,可能有上下文,时态用的是过去时,所以这里得这样,如果单就这个句子,你可以把changed改为changes,实际运用中肯定是用过去时的,因为这里的主语graph,是一个已经经过调查的结论,分析的数据肯定是过去调查的,所以用过去时是对的.而楼主问was changed,你分析下句子成分,研究下语法先.您的语法及语感在下不敢恭维,需要多加练习.
希望对您有所帮助.

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