22． is a free site, _________ visitors can not just purchase almost all kinds of products but open their own online shops.

A. where　 　　　　　　　　　　　 B. which　 　　　　　　　　　　 C. what　　　　　　　　　　　　　　 D. whose

第一节：单项填空(共15小题；每小题1分，满分15分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21．With the financial crisis ________ across the globe, a lot of companies have shut down and many people have been out of work.

A. to spread　　　　　　　　　　 B. spreading　 　　　　　　　 C. being spread　 　　　　　 D. having spread