2010 天津 第 4 题 单选题 区分题 2010_天津卷 (英语) 4. (1分)We on this project for four hours.Let's have a rest. ( ) A. are workingB. have been workingC. workedD. had worked 参考答案B ☆ 收藏不会,直接看解析查看原卷 →