题目

When I talked with my grandma on the phone, she sounded weak, but by the time we ____ up, he voice had been full of life．      A．were hanging         B．had hung      C．hung           D．would hang 答案：C 解析: 考查动词时态。此处是陈述一个事实，且为过去发生的动作，故应用一般过去时。

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