The river ______ very clean ten years ago, but now it is polluted.
举一反三
- We each other since known; ten years ago. A: have known; ten years ago B: knew; ten years ago C: have known; ten years D: knew; ten years
- Is this the factory ______ he worked ten years ago?
- Taiji boxing is good ______ health, so the old man began to practise it ten years ago and now he is good ______ it. A: for; to B: to; for C: for; at D: at; for
- She said to me that This old airport built ten years ago ___.
- A hundred years ago there were _____________ inhabitants on the island; now there are only ______.