题目内容

Experts are trying to work out a plan to deal with the problems caused by global warming
_____ it is too late.

A. when
B. if
C. before
D. until

试题答案

C
一题一题找答案解析太慢了
下载作业精灵直接查看整书答案解析
立即下载
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网