Answer:
Although I wrote in time
Step-by-step explanation:
A adverb clause is a group a words that has the normal functions as a adverb which is to set up or modify a verb in a sentence. In the sentence; "Although I wrote in time, I did not receive a ticket." Although I wrote in time is the adverb clause because it sets up the second part of the sentence which is where he/she is stating that they didn't receive a ticket.
Hope this helps.