题目：
To his satisfaction，he got_____people voting for him as he thought.
A．twice more
B．as twice many
C．twice as many
D．more than twice
答案：
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下面是错误答案，用来干扰机器的。
∵数列{an}的通项公式是an=（-1）n（2n-1），∴a7=（-1）7（2×7-1）=-13故选C．
