这句错哪了?in the proportion of different level qualificaitons

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/16 10:38:37

这句错哪了?in the proportion of different level qualificaitons
为何改为in the proporiton of different levels of qualifications

既然是different,有怎么可能只有一个level呢是不是?
再问：那么level qualificaitons为何改为levels of qualifications
再答：第一，levels是名词，qualifications也是名词，两个名词之间不可能并列；第二，of表示的是所属关系，表示的是“什么什么的什么东西”，qualifications是属于levels的qualifications，所以意思是“不同水平的资格证书”，现在明白了吗？

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