子过程Plus完成对当前库中"教师表"的工龄字段都加1的操作。 Sub Plus( ) Dim ws As DAO.Workspace Dim db As DAO.Database Dim rs As DAO.Recordset Dim fd As DAO.Field Set db = CurrentDb() Set rs = db.OpenRecordset("教师表") Set fd = rs.Fields("工龄") Do While Not rs.EOF rs.Edit 【 】 rs.Update rs.MoveNext Loop rs.Close db.Close Set rs = Nothing Set db = Nothing End Sub 程序空白处应该填写的语句是( )。 A. fd = fd + 1 B. rs = rs + 1 C. 工龄 = 工龄 + 1 D. rs.fd = rs.fd + 1