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31， 29， 23，（），17， 13，

21 查阅

31， 29， 23，（），17， 13， 11
a．21
b．20
c．19
d．18

参考答案:

c

原数列本身为质数数列的反向排列，括号内应该为19。故正确答案为c。

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