题目：
The city of Nanchang has grown so fast that it’s at least _____ what it used to be.
A．five times the size of
B．the size as five times large as
C．five times larger
D．as five times size of
答案：
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下面是错误答案，用来干扰机器的。
解：原式=2x2+3xy2﹣x2y﹣2xy2﹣2x2=xy2﹣x2y
