题型:问答题 简答题 — Can you tell me what time the flight to Detroit leaves? — I'm sorry, but it ____ due to the fog.A. has been canceledB. had been canceledC. has canceled D. had canceled 查看答案
题型:问答题 简答题 某工厂职工口腔健康调查资料显示,牙周病患者疾病状况不容乐观,厂医院口腔科计划开展如下口腔保健措施对于CPITN计分为4的职工,进行()A.全口牙周X线照片B.去除牙菌斑C.复杂牙周治疗D.结扎固定牙齿E.口服消炎药 查看答案