on the MSN, some people often use ‘88’ for ‘good-bye’.A. When chatB. When chattedC. When c

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A. When chat
B. When chatted
(答案→)C. When chatting
D. When to chat
解析：现在分词做状语。现在分词的动作与主语为主谓关系,做时间状语时可在分词前加when。“人们网上上聊天时经常用88表示再见”选C。