自从电冰箱、洗衣机、彩电在城市普及后,城市消费进入了新一轮消费升级的储备期,必须有新的一代“领航产品”的出现,才能带来新的消费热点。这里体现的经济学道理是
George returned after the war, only _______ that his wife had left him.
A good teacher must be able to hold his students’ attention ____ he reaches the end of the class.
Studies show that Americans chat on their phones for more than five hours a month, _____ Europeans.
--- I hope you enjoyed the film last night. -----How on earth do you know I went to a film? I ________ you.
This machine is very easy. Anybody can learn to use it in a few minutes.