Question

They had to pay fee on time .............?(question tag)​

Answer 1

Answer: hadn't they?

Explanation:

We can add question tags like isn't it?, can you? or didn't they? to a statement to make it into a question. Question tags are more common in speaking than writing.

We often use question tags when we expect the listener to agree with our statement. In this case, when the statement is positive, we use a negative question tag.