Tom went off to the EXPO Garden with his friends, an exciting day of discovering the unique culture of each nation．
A. expected
B. expecting
C. to expect
D. expects
网友回答
A. expected
(答案→)B. expecting
C. to expect
D. expects
解析： 考查现在分词作状语。expecting在这里做伴随状语，句意：汤姆和他的朋友们去了上海世博会园，期望发现每一个国家独特的文化的令人兴奋的一天。故选B。