57. The manager promised to keep me ______ of how our business was going on .　　　　 A)to be informed 　　　　 B)on informing 　　　　 C)informed 　　　　 D)informing

热心网友

C)informed keep rmed of sth.让某人了解某事.那个经理答应会告诉我我们生意的进展.