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
22．Taobao.com 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
