2) They are busy searching for information online in the library.

O2O的定义是? Online To Offline|offline to Online to offline|Online to offline to online|offline to online

O2O的定义是 A: offline to online B: Online To Offline C: offline to Online to offline D: Online to offline to online

O2O的形式有 A: Online to offline B: offline to online C: offline to Online to offline D: Online to offline to online

020是( )的缩写。 A: online to online B: offline to online C: offline to offline D: online to offline

What does O2O mean? A: One to One B: Offline to Online C: Online to Offline D: Online to Online

O2O是（ ）的英文缩写。 A: Online to Online B: Offline to Online C: Online to Offline D: Offline to Offline

O2O是( )的缩写(2.0) A: online to online B: online to offline C: offline to offline D: offline to online

移动O2O营销模式包括（ ）？ A: Online To Offline To Online模式 B: Offline To Online To Offline模式 C: Offline To Online模式 D: Online To Offline模式

中国大学MOOC: 2) It is now very common for people to_________ online their thanks to the volunteers.