单项选择题
A．was B．is C．has been D．should be
A．he knew what such a note would mean to the post office B．he had discovered giving-away made life more exciting C．he believed he would get something back by doing so D．the postman delivered an important letter in time
A．He can use computers in his work. B．He can handle orders promptly. C．He can get timely information. D．He can improve his sales performance.