问题补充：
No advertisement so farcan have the same effect as this one.
A. made
B. has been made
C. being made
D. to be made
答案：
(答案→)A. made
B. has been made
C. being made
D. to be made
解析：考查非谓语动词的被动语态。made是过去分词作定语，修饰 advertisements，表示动作的完成，与 so far这一状语是一致的。
