2,2,7,18,31,90,(),括号里应该填?a.57 b.69 c.86 d.79

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2,2,7,18,31,90,(),括号里应该填?a.57  b.69  c.86  d.79
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2,2,7,18,31,90,(),括号里应该填?a.57 b.69 c.86 d.79
2,2,7,18,31,90,(),括号里应该填?
a.57 b.69 c.86 d.79

2,2,7,18,31,90,(),括号里应该填?a.57 b.69 c.86 d.79
括号里应填(D)