题目内容：

Tony must pay the money back.He must____.
A.pay it again B.pay it C.repay it D.pay it once more

优质解答

选c
pay sth back:偿还
repay=pay back 也是偿还的意思
这道题的意思是让你把前面的话换句说法：
Tony must pay the money back.
汤姆必须还钱
这就话就等于He must repay the money.