When I talked with my grandma on the phone she sounded weak but by the time we up he v

问题补充：

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：

A. were hanging

B. had hung

(答案→)C. hung

D. would hang

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。