Our road information system should be improved so that we ____ know the road condition ahead of time...
2022-09-21 00:43:11 77次 牛津上海版英语九年级(9B) Unit4 单元测试（含听力） 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Our road information system should be improved so that we ____ know the road condition ahead of time．
A.must B.should C.can D.could
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