问题补充：
It was believed that the film “So Young”, once , would be very popular with the fans of the director—ZhaoWei.
A. being produced
B. producing
C. to produce
D. produced
答案：
A. being produced
B. producing
C. to produce
(答案→)D. produced
解析：考查状语从句的省略：句意：据相信电影《致青春》，一旦播出，就会受导演—赵薇的粉丝的欢迎。这是省略句，完整的是It was believed that the film “So Young”, once it was produced , would be very popular with the fans of the director—ZhaoWei.当主从句的主语一致的时候，可以省略从句的主语和be动词，选D。
