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1. Once out in the street, she walked quickly towards her usual bus stop. Once out in the street 相当于 Once she was out in the street 引导时间状语从句。在从句主语与主句主语一致时，从句可省略主语。 First aid, if (it is) properly done, can save a person’s life. Once 可用作连词，意思为：一… 就，一旦。 e.g 一旦出版，这本词典会非常畅销。 Once (it is ) printed, this dictionary will be very popular. 他一到我们就可以动身。 Once he arrives we can start. Once可用作副词，意思为：一次；曾经。 请注意我把问题再重复一遍。 "Attention please, I'll repeat the question once more." 2. ‘Sorry, Miss,’ replied the man, ‘the truth is that the fogs too thick for the bus to run that far. 句中第一个that引导的是表语从句。 问题是我们钱已用完了。 The problem is that we have run out of money. 第二个that (或this) 在此处等于so，意思是“那么” （或“这么”），修饰形容词或副词。 艰辛会使人变化那么大吗? Can hard work change a person that much? 3. L16. ..the rest of.. L 32…his hand resting on her arm. | 
