——With 4G mobile phones people can even see each other as they talk——Really? Would you

问题补充：

——With 4G mobile phones, people can even see each other as they talk.

——Really? Would you show me it, please?

A. how to use

B. when to use

C. where to use

D. what to use

答案：

(答案→)A. how to use

B. when to use

C. where to use

D. what to use

解析：句意：随着4G手机的问世，人们可以在通话时能够看见对方。真的吗？你能给我演示一下如何操作吗？How加不定式做show的宾语，表达使用的方式；故选Ａ。