单项选择题
A．whom B．to whom C．who D．to who
A．Advertising does not always increase sales. B．Advertising serves to relay information from buyers to producers. C．Advertising is and will continue to be a necessary part of everyday life. D．It is suggested that advertising should be abolished.
A．if advertising continues to exist B．if the link between the customers and manufacturers remains good C．if "the criticized child" dies out D．if society has become more industrialized