题目内容
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
C
解析:by引导的时间状语从句常与完成时连用。根据“her voice had been full of life”所选用的过去完成时,可知by引导的是表过去的时间状语从句,故选一般过去时。
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