单选题 Employees who wish to be reimbursed should submit ______ of their completed expense vouchers by the last day of each month.

【正确答案】 A

【答案解析】[考点] reimburse报销 submit上交，提交 expense voucher费用凭证
[解析] 语法题。submit后须接名词宾语，D项copier(复印机)不符合句意，故A项copies为正确答案。