Just wondering, could a ge go after the shang? I think that's how I've usually seen last week/month/year written but I wasn't sure if it had to be different here
I too was surprised to see no measure word being used here.
天 and 年 never take measure words. 月 always takes a measure word. For 星期 the measure word is optional.
I think 星期 is its own measure word. Likewise with 天 and 年.
"上個星期" is valid Chinese for "last week", but "上個星期沒有下雪。 " and "上個星期沒下雪。 " are both rejected answers.
上个星期没有下雪 was rejected (09/2020)
Where i了？ 上个星期没有下雪了
了 shows an action that was started in the past and completed. Since the action of snowing was never started nor completed, there is no 了.
The 没有 here, acts to indicate that it was in the past along with 上星期。了 here is not necessary
It appears that any answer that uses a classifier ("個") for "last week" (i.e., "上個星期") is rejected as well as any answer that uses "沒", the short form of "沒有".
These were all rejected:
I don't get why 有 is required here... Isn't 上星期没下雪 correct?