Her new book is about a murder mystery on actual murders that took place in Florida several years ago.
A. having been based
B. to be based
C. based
D. having based
网友回答
A. having been based
B. to be based
(答案→)C. based
D. having based
解析：考查过去分词短语作后置定语。 be based on 以什么为基础，句意:她的新书是关于一本神秘谋杀的书，它是以几年前发生在佛罗里达的实际的谋杀案为基础的。故选C。