游客
题文

Since the new speed limits ______,the number of accidents in the area has fallen strikingly.

A.were introduced B.introduced
C.have been introduced D.have introduced
科目 英语   题型 单选题   难度 中等
知识点: 动词语态
登录免费查看答案和解析

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号