where is Miss Li?i saw her in the park___i am not sure if she is still thereat once\\\\\just now\\\\ so far\\\\right now选什么为什么

where is Miss Li?i saw her in the park___i am not sure if she is still thereat once\\\\\just now\\\\ so far\\\\right now选什么为什么
where is Miss Li?i saw her in the park___i am not sure if she is still there
at once\\\\\just now\\\\ so far\\\\right now选什么为什么

where is Miss Li?i saw her in the park___i am not sure if she is still thereat once\\\\\just now\\\\ so far\\\\right now选什么为什么
答案：just now,刚才,用于过去时态
at once离开,马上
so far到目前为止
right now此刻,就在现在,常用于现在进行时

just now 刚才
（ AT ONCE 马上， SO FAR 到目前为止，RIGHT NOW 马上，这三项与句意不符）