The old man told the policeman he saw the accident_____ (happen) when he was passing by.

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The old man told the policeman he saw the accident_____ (happen) when he was passing by.

The old man told the policeman he saw the accident_____ (happen) when he was passing by.
The old man told the policeman he saw the accident_____ (happen) when he was passing by.

The old man told the policeman he saw the accident_____ (happen) when he was passing by.
happen .
.see sth./sb.do sth.看见了某事发生/某人做某事
see ...doing 看见某人正在做某事
其中,happen 这个词不是个延续性的动词,发生这个动作是瞬间的,我们不能说发生一直在延续,所以不可能用happening 的形式.