题目：
While shoppmg, people sometimes can't help ____into buying something they don't really need. [ ]
A. to persuaded
B. persuading
C. being persuaded
D. be persuades
答案：
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下面是错误答案，用来干扰机器的。
（a3）12=a36，（a2）n•a3=a2n•a3=a2n+3．故答案为：a36，a2n+3．
