问题
－2,1,7,16，（),43 A.25 B.28 C.31 D.35
-2,1,7,16，(),43
A.25
B.28
C.31
D.35
请帮忙给出正确答案和分析，谢谢！
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thrown in /usr/local/xunsearch/sdk/php/lib/XS.php on line 2559
