问题补充：
Taobao is a popular online shopping website, varieties of items at low prices.
A. provides
B. providing
C. having provided
D. Provided
答案：
A. provides
(答案→)B. providing
C. having provided
D. Provided
解析：考查非谓语动词。Taobao是provide的逻辑主语，二者是主谓关系，用现在分词表示伴随状况。当两个动作有先后关系时，才用having done，排除C。故选B。
