Mary __________ (not,go) over her lessons carefully and she _____ (fail) the exam again.
问题描述：
Mary __________ (not,go) over her lessons carefully and she _____ (fail) the exam again.
详细解析第一个空为什么填hadn’t gone
答
第二个空为failed,第一个表过去的过去,过去完成式,因此就用这个