问题补充：
---We can use QQ to communicate with each other online.
---Will you please show me?
A. which to use
B. how to use it
C. what to use
D. where to use it
答案：
A. which to use
(答案→)B. how to use it
C. what to use
D. where to use it
解析：which to use用哪一个；how to use it如何使用它；what to use有什么；where to use it在哪儿用它。句意：我们能够用QQ在线相互交流。——你能告诉我如何使用它吗？结合语境可知选B。
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