I'm guessing a dummy run is something that you use a test dummy to see how something will work, example a crash dummy were they put inside a car that crashes to a solid object . a trial run/procedure kind.
(hope this help)
Answer:
I think it is "The sun begins to retreat as autumn progresses." But I'm not 100%
Explanation:
I hope it is helpful for you .....
b
took the test just now
