问英语IELTS题目

问题描述:

问英语IELTS题目
She____well at school but that changed when she became friends with a different group of girls.
A did B had done C had been doing
我想选A强调过去的客观事实 可以解释下为什么吗

had been doing表示动作到过去某一时刻为止一直在做
联系句子 我想你应该懂了.
直到加入另一群女生.为止