问题补充：
Shanghai is most beautiful city and we are excited that the World Expo has been great success.
A. a; a
B. the; a
C. a; the
D. the; the
答案：
(答案→)A. a; a
B. the; a
C. a; the
D. the; the
解析：考察冠词，“上海是一个非常美丽的城市，的世博会这么成功我们很兴奋。”第一空不用最高级，第二空抽象名词具体化，答案A。
