The Shanghai Expo has attracted more than 73 million tourists it the most successful in

问题补充：

The Shanghai Expo has attracted more than 73 million tourists, it the most successful in history.

A. making B. makes C. made D to make

答案：

解析：考查现在分词做结果状语，表示顺理成章的结果，句意：上海世博会吸引的7千3百万的人，使它成为历史上最成功的。选A。