预防乙脑的有效措施是() A.隔离乙脑病人 B.接种乙脑疫苗 C.切断一切传播途径 发布时间:2018-01-27 09:42 │ 来源:www.tikuol.com 题型:单项选择题 问题: 预防乙脑的有效措施是()A.隔离乙脑病人B.接种乙脑疫苗C.切断一切传播途径D.不知道
题型:单项选择题 — Peter, where did you guys go for the summer vacation?— We________ busy with our work for months, so we went to the beach to relax ourselves. [ ]A. were B. have been C. had been D. will be 查看答案