( )on the MSN ,some people ofen use "88" for "goodbye".A When chat B When chatting C When chatted D When to chat

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( )on the MSN ,some people ofen use "88" for "goodbye".A When chat B When chatting C When chatted D When to chat
( )on the MSN ,some people ofen use "88" for "goodbye".
A When chat B When chatting C When chatted D When to chat

( )on the MSN ,some people ofen use "88" for "goodbye".A When chat B When chatting C When chatted D When to chat
B When chatting
现在分词作状语,表示主动与进行的

选择a ,因为 语态为一般语态,和后面的语态应该一致

B
这和分词没什么关系。这是时间状语从句,when引导时间状语从句时,如果从句、主句主语相同,从句中有Be动词。则在从句可省略主语与Be动词。所以可知此题的从句必定是进行时。选B

B 时间状语从句中的省略,主句和从句主语一致,且谓语动词是系动词,可省略从句的主语和谓语。
补充完整:When people are chatting on the MSN ,some people ofen use "88" for "goodbye".