摘要：When I 1 in London last year, it had one of the thickest fogs(雾) in years. You could 2 see your hand in 3 of your face. When evening fell, it became even 4 . All traffic 5 to a stop. I decided to walk. A few minutes 6 , I couldn’t find my 7 . Then I saw a young man and asked him to help me. He agreed. As I was following him 8 the streets, he told me, “I know this part of London quite well. And the thick fog 9 to me. You see, I’m 10 . 1.A. is B. was C. am D. are

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