–We can use it to chat with each other on the Internet.--Really? Will you please show me

问题补充：

–We can use it to chat with each other on the Internet.

--Really? Will you please show me it

A. how to use

B. what to use

C. how can I use

D. what can I use

答案：

(答案→)A. how to use

B. what to use

C. how can I use

D. what can I use

解析：英语宾语从句中一般为陈述语序。How引导宾语从句表示方式方法，做状语。What引导宾语从句充当主语，宾语，表语。句意：我们可以用它来在网上相互聊天。——真的吗？你能告诉我怎么用吗？结合语境可知选A，选项B表示用什么，不符语境。