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英语 高中 · 高二 北师大版 · 选择性必修第二册 单选题 ★★★★☆ 编号 #9939
My mother ___ a letter to a friend when I saw him.
A. was writing
B. has written
C. would be written
D. write
章节：动词的时态 · 知识点：过去进行时 · 标签：时态,过去进行时,语法
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