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英语 初中 · 九年级 译林版 · 九年级上册 单选题 ★★★★☆ 编号 #10089
The machine ___ at the moment in the 19th century.
A. is being invented
B. will invent
C. has been invented
D. must be invented
章节：动词的语态 · 知识点：现在进行时的被动语态 · 标签：被动语态,语法
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