【问】On arriving atthe shore，the girl struggled up the cliff towards the light she had seen.
 (New Concept English，Book 2，L.33)
 当姑娘到了岸边后，她奋力爬上悬崖，朝她看见的灯光爬去。(《新概念英语》(2)，朗文出版公司、世界图书出版公司，1993，P.138)
 从译文看，on arriving=after arriving。是否可以这样理解?
 【答】 不能这样来理解。on+动名词(或表动作的名词)这个结构表示它所表达的动作刚一发生或完成，句子谓语所表达的动作便接着发生。它相当于as soon as引导的时间状语从句。例如：
 1. On reaching the city，he called up Lester. (Dreiser)
 他一到达那个城市，就给莱斯特打了电话。
 2. I shall write to A. P. Watt on hearing from you. (Yeats)
 我一收到你的来信，将立即给A.P.瓦特写信。
 3. On arriving in England，they were taken to the Crystal Palace by train. (New ConceptEnglish，Book 2，L.80)
 他们一到英国便乘火车去水晶宫。
 4. On entering a shop，he would ask for a new perfume called ‘Scented Shadow’or for ‘in-soluble bath cubes.’ (New Concept English，Book 3，L. 52)
 一走进商店，他就立即询问叫做“香影”的新型香水或是“不溶浴皂”。
 5. On his return from Europe，Lester set to work in earnest. (Dreiser)
 莱斯特刚一从欧洲回来，便开始认真地工作。
 6. On his arrival at the airport he was greeted by the Prime Minister.
 他一到达机场便受到总理的欢迎。
 7. We demand cash on delivery. (RCD)
 我们要求货到付款。
 而after+动名词结构只表示“在……之后”，而不表示另一动作紧接其后发生。例如：
 1. After sending you that letter I recollected how stupid I was. (Yeats)
 当我把那封信寄给你之后我才想到自己有多傻。
 2. She put forward the suggestion to the director，who，after discussing it with other com-rades，decided to accept.
 她将建议交给了主任，主任与其他同志讨论后决定采纳。
 3. After crossing the equator，the captain called in at a port to have a new rudder fitted，but by now the Thermopylae was over five hundred miles ahead.(New Concept English，Book 3，L. 25)
 越过赤道后，船长让船进港装新舵，但此时瑟摩皮拉号已经领先五百多英里了。
 请做下面的英语试题：
 ____entering the hall he found everyone waiting for him.
 A. At B. While C. On D. In(Nelson，300C)