The city of Yiwu is unique attraction to tourists and businessmen at home and abroad as

问题补充：

The city of Yiwu is unique attraction to tourists and businessmen at home and abroad as there are various kinds of specialized markets in it.

A. an; /

B. the; the

C. a; /

D. /; the

答案：

A. an; /

B. the; the

(答案→)C. a; /

D. /; the

解析：考查冠词的用法。a unique attraction泛指一个独特的景点，at home and abroad固定短语：在国内外，所以选C。