in a school还是at

　　例句：

　　She now helps in a local school as a volunteer three days a week

　　目前她在当地的一家学校做志愿工作，一周去3天。

　　The refugees were lodged in a primary school.

　　难民被安置在一所小学里。

　　例句：

　　She was in my year at school.

　　她上学时跟我同级。

　　She never had any real friends at school.

　　在学校，她从来没有交过真正的朋友。