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英语 小学 · 四年级 外研版 · 四年级下册 单选题 ★★★☆☆ 编号 #9772
The little boy ___ the answer to the question for many years.
A. had known
B. known
C. is knowing
D. has known
章节：动词的时态 · 知识点：现在完成时 · 标签：时态,现在完成时,语法
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