on a true story, the film is well worth .
A. Based; seeing
B. Basing; seeing
C. To base; to see
D. Based; to be seen
网友回答
(答案→)A. Based; seeing
B. Basing; seeing
C. To base; to see
D. Based; to be seen
解析：句意：以真实的故事为基础，这个电影很值得一看。base... on 以…为基础，常用被动式be based on。the film 与base 之间为被动关系，故用过去分词形式。be worth doing 值得做，固定用法。所以选A。