英语 初中 · 九年级 译林版 · 九年级上册 单选题 ★★★★☆ 编号 #10038
The machine ___ since last year in the 19th century.
A. has been invented
B. is being invented
C. were invented
D. are invented
章节:动词的语态 · 知识点:现在完成时的被动语态 · 标签:被动语态,语法
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