since 作为连词(conj.)时,常用于现在完成时或过去完成时,表示自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了.
She has been living a hard life since her husband died.
她自从丈夫死后,一直过着艰苦的生活.
此句since 后用 she had ,故主句用过去完成时是正确的.
since 作为连词(conj.)时,常用于现在完成时或过去完成时,表示自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了.
She has been living a hard life since her husband died.
她自从丈夫死后,一直过着艰苦的生活.
此句since 后用 she had ,故主句用过去完成时是正确的.