2,5,20,12,-8,( ),10A 7 B 8 C 12 D -8

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2,5,20,12,-8,(),10A7B8C12D-82,5,20,12,-8,(),10A7B8C12D-82,5,20,12,-8,(),10A7B8C12D-8首尾2项相加之和为122+10=

2,5,20,12,-8,( ),10A 7 B 8 C 12 D -8
2,5,20,12,-8,( ),10
A 7 B 8 C 12 D -8

2,5,20,12,-8,( ),10A 7 B 8 C 12 D -8
首尾2项相加之和为12 2+10=12;20+(-8)=12;12;所以5+(7)=12
答案为A