题目内容
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
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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