A typical instant-messaging conversation lasts ________.
举一反三
- A typical instant-messaging conversation lasts ________.( ) A: more than one hour B: at least half an hour C: at least one hour D: more than one place
- Instant messaging can be ______ as IM.
- Instant messaging is a type of ________ service.
- 即时信息（Instant Messaging，IM）
- Instant messaging allows text only.