Question

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.”

1. A.
   after
2. B.
   when
3. C.
   before
4. D.
   until

Answer 1

C
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”。