题目内容：
阅读文章，选出合适的答案填在横线上，回答题：It was Clark's first visitto London Underground Railway. Against 36__________advice of his friends, hedecided to go there after 5 o' clocl in the afternoon. This is a bad time to 37__________in London, because numerous people go home from work 38__________this hour. Hehad to join a long 39__________ of people who were waiting for tickets. Whenhis turn came, he had some difficulty in making himself 40__________by the man selling tickets.However, he got the right ticket 41__________the end and, by asking people the 42__________ , he also found the right platform. It waspacked tight 43__________ people. He did not44__________ to get on the first train, but he was 45__________to move nearer to the edge of theplatform so as to be in a better 46__________toget on the next one.
When this train came in, Clark was 47__________forward on tothe'train by the 48__________ of people frombehind. The doors closed and the train49__________ off. He was unableto see the names of the stations where the train stopped, but he knew that thestation he wanted was the sixth 50__________along the line. When the train got to the sixth station, Clark got off, feelinggood that his 51__________ had been soeasy. But he suddenly 52__________ thathe had come to a station he had never heard of.He explained his difficulty to aman who was standing on.the platform. With a 53__________ on his face, the man 54__________ Clark that he had caughta train going in the opposite 55__________.
A．an
B．some
C．any
D．the
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