【正确答案】 B

【答案解析】固定词组辨析。pay for意为“为……而受惩罚，为……付出代价”，如：These people must be made to pay for their crimes．这些人必须为他们的罪行付出代价。pay off表示“还清(债款)”，如：We should be able to pay Off the debt within twoyears．我们应该能在两年内付清债款；pay back意为“偿还(欠款)”，如：I will payyou back tomorrow．我明天还你钱；pay up尤指“(不情愿地或迟迟地)付清，还清(债款)”，如：Eventually they paid up，but only after receiving several reminders．最后他们总算全部付清了，但那是在收到好几张催款单之后。