问题补充：
—We can use QQ to communicate with each other online.
—Good. 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：根据意思可知道答案为B，表示怎样去使用他。
