The film which the book by Jack London is well worth seeing.
A. based
B. is based in
C. is based on
D. to be based
网友回答
A. based
B. is based in
(答案→)C. is based on
D. to be based
解析：考查固定结构。Be based on…以……为基础,为依据。which the book by Jack London是定语从句，先行词是The film。句意：这部以Jack London的小说改编的电影非常值得一看。所以选C。