Number three because the rest use commas
Where are the options? Need to see them to decide on the answer. T-t-t-today junior!!
There are no "shown" because you didn't give us anything, nobody can help without resources for questions like this!
<u>Answer</u>:
Present Perfect Continuous: "I have not been allowing this to happen."
<u>Explanation</u>:
Present Perfect Continuous Tense indicates that something started in the past and is continuing at the present time.
