Air pollution will remain a problem for a long time, we have done a lot to solve it. A. because B. a...
2022-09-30 18:40:46 162次 江苏省苏州市昆山、太仓市2019届九年级第一学期期末教学质量调研测试英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Air pollution will remain a problem for a long time, we have done a lot to solve it.
A. because B. although C. unless D. since
本题链接：
