The Department of Agriculture slowly succeeded in convincing farmers to try approaches other than the single-crop farming that they had used for many years.
convincing farmers to try approaches other than the single-crop farming that they had used wrong usage of
wrong usage of hadconvincing farmers to try approaches other than the single-crop farming that they used
wrong usage of simple past as the activity is still running in the presenttheir attempt to convince farmers to try approaches other than the single-crop farming that they had used
wrong usage of hadtheir attempt to convince farmers to try approaches other than the single-crop farming that they used
wrong usage of simple past as the activity is still running in the presentconvincing farmers to try approaches other than the single-crop farming that has been in use for many years
Correct