—It'scooltomakeashortvideobyyourmobilephone.Letmetellyo...

问题详情：

—It's cool to make a short video by your mobile phone. Let me tell you ______．

—Great! Thank you very much.

A．why to use           B．how to use it

C．when to use          D．what to use it

【回答】

B　

知识点：非谓语动词

题型：选择题