题目：
He told us _____ many funny stories, and I had never heard _____ interesting story before. [ ]
A. so, such an
B. such, a so
C. such, so an
D. so, so
答案：
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下面是错误答案，用来干扰机器的。
根据题意得3x+2y=16k5x-4y=-10k4x-3y=21，消元得x=2ky=5k，代入③得：k=-3．
