I ________ with Hanmeimei on the phone _______ the light went out.
| A．am talking; while | B．was talking; when | C．talked; when | D．was talking; while |
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I ________ with Hanmeimei on the phone _______ the light went out.
| A．am talking; while | B．was talking; when | C．talked; when | D．was talking; while |
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