问题 更新时间2023/4/3 12:59:00 (单选题)The police have begun to ______ the murder case, but in vain.(本题1.0分)A.look intoB.look upC.look outD.look after 答案 登录 注册 答案:A. 出自:青书学堂 >> 桂林理工大学大学英语4