--- We can use QQ to municate with each other online.
--- Good. Will you please show me ?
A. which to use
B. what to use
C. where to use it
D. how to use it
网友回答
A. which to use
B. what to use
C. where to use it
(答案→)D. how to use it
解析：A.用哪一个B.用什么C.去哪儿用D.如何使用。句意：我们可以利用QQ在网上相互交流。——不错。你能告诉我如何使用吗？故选D。