题目

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   答案：C 解析: 考查时态。By the time 后的从句中多用一般现在时和一般过去时。根据该题的语境可以断定答案为:C.  

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