In order to the debt, the couple has worked hard for years with little food and only a small room to live in and never a moment's rest.
A. pay for
B. pay back
C. pay
D. return back
网友回答
A. pay for
(答案→)B. pay back
C. pay
D. return back
解析：pay back表“偿还”，pay for仅表“付钱”。