一道SAT改错题Social scientists agree that a system for exchanging

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/12 11:04:14

一道SAT改错题
Social scientists agree that a system for exchanging goods and services is not only present but also of necessity in all societies.
答案说for exchanging 错了,可是我认为of necessity 错误,因为not only but also 要用平行结构,of necessity 应为NECESSARY.
到底谁对啊?

for exchanging 是最明显的错误,如果你要改of necessity --> necessary,还要该in --> for ...in 有划线么?不管怎样,先把最明显的错误找出来,你想太多了=）

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