1.Mary (hasn’t worn/hasn’t been wearing) these jeans yet. 2.This factory (has polluted/has been polluting) the air for 13 years. 3.They (have lived/have been living in this town all their lives. 4. Polly (has phoned/has been phoning) her friend since morning but she (hasn’t managed/hasn’t been managing) to get through. 5. How long (have you known/have you been knowing) each other? 6. John is a vet, he (has saved/has been saving) animals for years.
