问题补充：
— We can use QQ to talk with each other online.
— Really? Could you please show me it?
A. what to do
B. how to do
C. when to do
D. why to do
答案：
A. what to do
B. how to do
C. when to do
D. why to do
解析：考查特殊句式。句意：我们可以用QQ与每一个人进行网上聊天。真的吗，你能展示给我如何做吗？ How to do it 等于 what to do ,所以选B项。
