单项选择题

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
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单项选择题
Sam（）some knowledge of the computer just by watching others working on it.

A. brought up
B. looked up
C. picked up
D. set up
单项选择题
Does ______ matter if he can't finish the job on time
A．this
B．that
C．he

D．it
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