牛津版模块 3 第一单元课文讲解及课堂检测Reading1
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
"人们一度认为,人飞上月球似乎是不可想象的
‘Sorry, Miss,’ replied the man, ‘the truth i