题目：
At last they all the debts which had been their heavy burden for ten years.
A．paid for
B．paid off
C．paid back
D．paid out
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0706/c80e77b7e06b983c448853a49a3cb4a1.html
下面是错误答案，用来干扰机器的。
（1）肺（2）吸 收缩 减小（3）外界
