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

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

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

has;been

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。