问题补充：
--Have you _your debt?
---Yes, we worked day and night to .
A. paid off, pay for them
B. paid for, pay them
C. paid, pay for them
D. paid for, pay them off
答案：
(答案→)A. paid off, pay for them
B. paid for, pay them
C. paid, pay for them
D. paid for, pay them off
解析：本题考查pay的短语。pay off还清(债)；pay for赔偿， 付款。
