Mr zhang was walking along the street _____suddenly a car stopped just befor himA when B if C so D because

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Mr zhang was walking along the street _____suddenly a car stopped just befor him
A when B if C so D because

be doing sth when...是个固定句式,表示(某人)正在做某事的时候突然(另外某事)发生了
类似句式还有be about to do sth when
例如 i was about to leave when it started to rain.