They were in the library just now是什么时态?

问题描述:

They were in the library just now是什么时态?

从just now(刚才)可以判断出是一般过去时.老师说JUST NOW 和now是一样的不一样的,just now是刚才,过去时的标志; now是现在,现在进行时的标志。