表达志愿服务经历的句型 — 英语选择题
题目
李华去年成为图书馆志愿者，至今仍在服务。下列哪句最准确地表达他的志愿服务经历？A. Li Hua volunteered at the library last year. B. Li Hua has been a volunteer at the library since last year. C. Li Hua will be a volunteer at the library. D. Li Hua was a volunteer at the library.