last week's talent show was a great successlast week's talent show is a great success哪一个正确呢?为什么?

last week's talent show was a great successlast week's talent show is a great success哪一个正确呢?为什么?
last week's talent show was a great success
last week's talent show is a great success
哪一个正确呢?为什么?

last week's talent show was a great successlast week's talent show is a great success哪一个正确呢?为什么?
last week's talent show was a great success
因为last week 我们可以得到 他是在过去发生的事情
be 动词要改到过去时态 所以 is应改为was

第一句，过去时用was

last week's talent show was a great success