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--- ________ did your uncle leave his home town? --- Let me see. He ________ for nearly 20 years. A....
题目内容：
--- ________ did your uncle leave his home town?
--- Let me see. He ________ for nearly 20 years.
A. When; has been away B. When; has left
C. How long; has left D. How long; has been away
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