问题描述：
考研英语09text2英文句子结构分析
DNA testing is also the latest rage among passionate genealogists--and supports businesses that offer to search for a family's geographic roots.
从-AND后开始分析.businesses that .这里面的that是什么用法?如果是DNA testing is also the latest rage among< passionate genealogists--and supports businesses> that offer to search for a family's geographic roots.那么offer为什么不加s?
DNA testing is also the latest rage among passionate genealogists--and supports businesses that offer to search for a family's geographic roots.
从-AND后开始分析.businesses that .这里面的that是什么用法?如果是DNA testing is also the latest rage among< passionate genealogists--and supports businesses> that offer to search for a family's geographic roots.那么offer为什么不加s?
问题解答：
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