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英语 高中 · 高一 人教版 · 必修第二册 单选题 ★★★★☆ 编号 #9983
The letters ___ today to the office.
A. is sent
B. are sent
C. must be sent
D. have sent
章节：动词的语态 · 知识点：含情态动词的被动语态 · 标签：被动语态,语法
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