--- ________ did your uncle leave his home town?.
--- Let me see. He _______ for nearly twenty years.
| A．When; has left | B．When; has been away |
| C．How long; has left | D．How long; has been away |
--- ________ did your uncle leave his home town?.
--- Let me see. He _______ for nearly twenty years.
| A．When; has left | B．When; has been away |
| C．How long; has left | D．How long; has been away |
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