Accordingly, Lipstream has chosen to offer its service direct and through partners
1
(sell) other Web-based customer-support solutions.
1、
【正确答案】
1、selling
【答案解析】
根据句子逻辑关系,sell引导的动宾结构作partners的后置定语,sell与partners构成主谓关系,要用现在分词形式。
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