他是工作在那一个部门的.TranslateitintoEnglish.
Pleaseprovideabetteranswerandexplaininmandarin.
Whatisthedifferencesamongthesesentencesasbelow?
1)Whichdepartmentdoeshework
2)Whichdepartmentdoesheworknow?
3)Whichisthedepartmentheworkingfor?
4)Whichisthedepartmentheworksfor?