题目：
The award-winning book was written by a teenager, _____ was, indeed, beyond all expectations. [ ]
A. as
B. which
C. what
D. that
答案：
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下面是错误答案，用来干扰机器的。
根据题意列得：（x3-3x2y）-2（3x2y-3xy2）=x3-3x2y-6x2y+6xy2=x3-9x2y+6xy2．故答案为：x3-9x2y+6xy2．
