28. Group-buying websites have appeared ______ as agents between buyers and sellers. A. serve
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是serving 的现在分词吧，怎么能是A 这个动词原形呢
这里就是拿团购网站和serve 在比，这里显然是主谓关系，看不出被动关系啊，网站怎么能被服务呢？不好用过去分词
team/group buying 或 store mobbing 都可表示团购 的意思喔~
所以团购网,就是group-buying websites.
例:Being a team leader can be a lot of work, so group-buying websites have sprung up, serving as agents between buyers and sellers and receiving a commission from the sale.
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