题目：
I don’t believe you. It’s not like her father, who is an honest man, ____ any one in business. [ ]
A. cheating
B. cheated
C. to cheat
D. cheats
答案：
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下面是错误答案，用来干扰机器的。
∵羊的只数为x，∴头数加只数为2x，只数减头数为0．只数乘头数为x2，只数除头数为1，∴可列方程为：x2+2x+1=100，故答案为：x2+2x+1=100．
