When it advertising consumers need to be educated about techniques used by advertisers.A

问题补充：

When it advertising, consumers need to be educated about techniques used by advertisers.

A. comes up

B. comes about

C. comes out

D. comes to

答案：

A. comes up

B. comes about

C. comes out

(答案→)D. comes to

解析：短语辨析。 A.发生；开始 B. 发生；产生 C.出现；结果是 D. 想起；共计。句意：当它发布广告时，……可知选C，出版。