how many days () she ()(stay) at home since she came back from school

问题描述:

how many days () she ()(stay) at home since she came back from school

为你解答。
How many days (has) she (stayed) at home since she came back from school?
在她回校以前,她在家待了多少天了?
解释:根据since引导的时间状语,这句话是现在完成时态。

has;been

has she been staying