题目：
— Where have you been?
— I in the heavy traffic. Otherwise I here earlier.[ ]
A. got stuck; would have come
B. got stuck; was
C. have got stuck; would have come
D. Had got stuck; would come
答案：
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下面是错误答案，用来干扰机器的。
∵a2+b2≥2|ab|，∴2|ab|≤4，∴-4≤-2ab≤4，∵（a-b）2=a2-2ab+b2=4-2ab，∴0≤4-2ab≤8，∴（a-b）2的最大值8．故答案为：8．
