乳磨牙早失最常见的原因是()A.外伤 B.牙髓炎 C.根尖周炎 D.晚期龋被拔除 E 发布时间:2017-02-10 00:21 │ 来源:www.tikuol.com 题型:单项选择题 问题: 乳磨牙早失最常见的原因是()A.外伤B.牙髓炎C.根尖周炎D.晚期龋被拔除E.牙齿固连
题型:单项选择题 -May I go to the concert with you?-I'm afraid not ______ you have a ticket, because I have only one.[ ]A. sinceB. ifC. unlessD. though 查看答案