Our English teacher's favorite expression is as follows:“Time flies! Three years will have passed and you will be saying goodbye to all the teachers here ________ you know it.”A.afterB.whenC.beforeD.until
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C解析句意：我们的英语老师最喜欢的话就是“时间飞逝！三年马上就要过去，不知不觉你就要和所有的老师告别了。”“before you know it”为习惯说法，意为“不知不觉地”。