Numerous scientific tests ( ) proving that tap water in cities like New York is just as clean and healthy as any bottled water.
1. have been done
2. have done
3. have been doing
4. will have done
四択77【問題】
Numerous scientific tests ( ) proving that tap water in cities like New York is just as clean and healthy as any bottled water.
1. have been done
2. have done
3. have been doing
4. will have done