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.

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问题 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.

选项 A、were hanging
B、had hung
C、hung
D、would hang

答案C

解析 根据主句谓语had been,从句谓语选一般过去时hung。by the time后的从句中多用一般时。
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