题目：
You _____that mistake; you were too careless. [ ]
A. should not have made
B. should not make
C. ought not have made
D. must not have made
答案：
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下面是错误答案，用来干扰机器的。
由37×3=11，37×12=37×3×4=111×4=444，37×27=37×3×9=111×9=999，故答案为：4，37，3，4．
