问题
选择题
After three years of hard work, they at last _____ all the money they had borrowed.
A．paid off
B．paid back
C．paid in
D．paid for
答案
答案：B
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After three years of hard work, they at last _____ all the money they had borrowed.
A．paid off
B．paid back
C．paid in
D．paid for
答案：B