I was about to leave_________I saw him_______ towards me, with a bag in handA.while; runningB.when; runningC.as; ranD.when; to run
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B解析考查固定句型。句意“我正要准备离开时，突然看见他向我跑来，手里拿着一个包。”be about to do sth. when...“正要做某事时，突然发生......”。see sb. doing sth.“看见某人正在做某事”。故选B。