（2015•黑龙江龙东）—Many people talk about "Didi". I really wonder ______. —You call to order a taxi through it on your mobile phone easily.

题型：单选题题类：真题难易度：普通

—Many people talk about "Didi". I really wonder ______.

—You call to order a taxi through it on your mobile phone easily.

A、how can I use them B、who uses them most C、what they are used for

举一反三

- For two weeks.

— Sorry, I don't know. I will call you when he comes back.

—Only 5 minutes' walk.

—Sure. He is a scientist who was born in the UK.

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