— He’s fifteen years younger than you!— ?A. What may B. So what C. What if D. What about

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A. What may
(答案→)B. So what
C. What if
D. What about it
解析：考查交际用语。So what 那又怎样；What if要是……将会怎样；What about it这是什么。句意：他比你年轻15岁。那又怎样？选B。