单选题 5.  It was impossible for the bank to collect on the money, so they were forced to ______ the loan.
【正确答案】 B
【答案解析】 选项A错误，write down意思是“记下，写下”。选项B正确，write off意思是“取消，勾销”。选项C错误，write in意思是“在选票上加写(人名)”。选项D错误，have written是现在完成时，而此处应使用动词原形。