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_____on the MSN, some people often use ‘88’ for ‘good-bye’.

___________ on the MSN, some people often use '88' for 'good-bye'.

A．When chat      B．When chatting   C．When chatted          D．When to cha

_____on the MSN, some people often use ‘88’ for ‘good-bye’.

_____ on the MSN，some people often use “88” for “good??bye”．

A．When chat

B．When chatting

C．When chatted

D．When to chat

______ on the MSN，some people often use “88” for “good?bye”．

A．When chat

B．When chatting

C．When chatted

D．When to chat