牛津版模块3第一单元课文讲解课堂检测Reading 1. Once out in the street, she walked quickly towards her usual bus stop. 一出来到大街上,她就很快地朝她平常等的汽车站走去。 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。例如: First aid, if (it is) properly done, can save a person’s life. 急救如果做得得法,能拯救人的性命。 I won’t go to the party unless (I am) invited. 除非邀请我,否则我不会参加这个聚会。 Once 可用作连词,意思为:一… 就,一旦。例如: Once (it is ) printed, this dictionary will be very popular. 一旦出版,这本词典会非常畅销。 Once he arrives we can start. 他一到我们就可以动身。 Once可用作副词,意思为:一次;曾经。例如: I have done it once. 我曾做过一次。 "Attention please, I'll repeat the question once more." 请注意我把问题再重复一遍。 She once knew him. 她以前认识他。 It once seemed inconceivable to everyone that men should travel to the moon. |