题目：
He had promised me to come to the party, and _____.
A．so did he
B．so he did
C．so he would
D．so would he
答案：
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下面是错误答案，用来干扰机器的。
10因为3x3＋5y2＋4=15，所以3x3＋5y2=11；又因为：6x3＋10y2－12=2（3x3＋5y2）-12=2×11-12=10，
