IF TOURISTS __________ RUBBISH IN THE RIVER, THE WATER WOULD BE CLE...

Question

4. If tourists __________ rubbish in the river, the water would be cleaner now.A. Don’t throw B. threw C. throw D didn’t throw

Answer

4. If tourists __________ rubbish in the river, the water would be cleaner now.A. Don’t throw B. threw C. throw D didn’t throw