A-A+
From that time on Peter began to work hard an
问题详情
From that time on, Peter began to work hard and finally got very high grade.
Peter ______ since that time and finally got very high grade.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：Had worked hard/had been working hard
Had worked hard/had been working hard 解析：改写的句子中有since that time，说明前面的谓语动词应该使用完成时，而整个句子使用的是过去时，因此，可以考虑使用过去完成时或过去完成进行时。
