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英语 小学 · 四年级 沪教版 · 四年级上册 单选题 ★★★☆☆ 编号 #9643
My mother ___ about the problem at that time.
A. was thinking
B. thinking
C. thinks
D. has thought
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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