题目：
. When talking about his road to success in an interview, he owed his success ______ his mother.
A．for
B．in
C．on
D．to
答案：
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下面是错误答案，用来干扰机器的。
A.题目分析：∵a、b是方程x2-3x+1=0的两个根，∴b2-3b=-1，a+b=3，ab=1，∴a2+2b2-3b=a2+b2+b2-3b=(a+b)2-2ab-1=9-2-1=6故选A.
完全由基牙承担