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When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up , her voi...
题目内容：
When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up , her voice had been full of life.
|
A．were hanging |
B．had hung |
C．hung |
D．would hang |
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