只允许细胞单行通过的血管是( ) A.小动脉 B.小静脉 C.毛细血管 D.金鱼 发布时间:2017-07-17 18:55 │ 来源:www.tikuol.com 题型:选择题 问题: 只允许细胞单行通过的血管是( )A.小动脉B.小静脉C.毛细血管D.金鱼尾鳍的血管
题型:选择题 — Did you see the film last week? — Yes. I ____ it twice already. [ ]A. sawB. had seen C. was seeing D. have seen 查看答案