Translation:It didn't snow last week.
It won't even take "it did not snow last week" instead of "didn't snow last week"
This is probably the worst example of the absurd lack of English answers and nothing ever being done about it even if you report it repeatedly over the course of a year.
Had I known this course would be so badly maintained I would have never started it. You just keep getting marked wrong for their lack of effort, not yours. Who would pay for this?