Whether by accident or _______, he arrived too late to help us.

A. purpose    B. aim  C. design    D. chance

C


解析:

purpose常與介詞on, for或with連用。aim at “針對”；by chance“偶然地”與by accident同義。by design“蓄意地，有意地”。題意為：不知道是碰巧還是故意的，他到的太晚了，沒能幫我們。根據(jù)句子邏輯。

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