When I talked with my grandma on the phone, she sounded weak
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正确
D. would hang
为什么D对?D可以理解为在我们将要挂电话的时候么?
D不对，答案选C
A. were hanging
B. had hung
C. hung正确
D. would hang
为什么D对?D可以理解为在我们将要挂电话的时候么?
D不对，答案选C
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