SAT 语法IP的一道题Almost all drugs go through strict teasing before【 approval and failing】 at least once.这里为什么要改成 approval,failing?

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SAT 语法IP的一道题Almost all drugs go through strict teasing before【 approval and failing】 at least once.这里为什么要改成 approval,failing?
SAT 语法IP的一道题
Almost all drugs go through strict teasing before【 approval and failing】 at least once.
这里为什么要改成 approval,failing?

SAT 语法IP的一道题Almost all drugs go through strict teasing before【 approval and failing】 at least once.这里为什么要改成 approval,failing?
题目中的teasing应该是testing,least感觉也是多出来的
然后 before approval：这个一个状语,在批准之前
Almost all drugs go through strict teasing before approval
在批准之前,几乎所有的药品都通过了严格的审核.
failing at once.=or failing at once ：否则（即不通过）就立即被否决.
这是一个分词作状语,表示假设的一个条件
希望能帮到您

首先你要理解到句子的两个动词是go和fail,也就是说如果括号里是approval and fails,是可以通过的. 然后就比较简单了fail+ing现在分词作状语.

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