Advertising is different from other forms of communication in that the advertiser pays for

问题补充：

Advertising is different from other forms of communication in that the advertiser pays for the message .

A. to deliver

B. delivered

C. to be delivered

D. delivering

答案：

A. to deliver

B. delivered

(答案→)C. to be delivered

D. delivering

解析：广告不同于其他的交流形式因为广告商要为即将传递的信息付费。the message与 deliver为被动关系从时间关系上看是没到的时间所以要用不定式的被动式，而delivered虽为被动但是表示的是做过的动作不符合句意所以答案为C。