Whether by accident or , he arrived too late to help us.
A. purpose
B. aim
C. design
D. chance
网友回答
A. purpose
B. aim
(答案→)C. design
D. chance
解析：选C。purpose常与介词on, for或with连用。aim at “针对”；by chance“偶然地”与by accident同义。by design“蓄意地，有意地”。题意为：不知道是碰巧还是故意的，他到的太晚了，没能帮我们。根据句子逻辑。