We can use QQ to talk with each other online.
--Good! Will you please show me it?
A. what to use
B. how to use
C. when to use
D. where to use
网友回答
A. what to use
(答案→)B. how to use
C. when to use
D. where to use
解析：本题的含义为我们可以使用QQ在网上交谈，请问你能告诉我如何使用QQ吗？在英文中疑问词how可以加动词不定式to do来代替从句作宾语，故本题选B。