What did people use before paper__________?A.invented B.was invented

分类: 作业答案 • 2021-12-30 14:14:16

问题描述：

What did people use before paper__________?A.invented B.was invented
What did people use before paper__________?
A.invented B.was invented
可A为啥不行?

答

before 后面引导的是一个时间状语从句,必须是完整的句子,所以,选B.
选A容易引起歧义,可以解读成：在被发明的纸张面前,人们用什么.这不合题意,