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1.By the time I got to school,the bell _____(ring)

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1.By the time I got to school,the bell _____(ring)
2.When did the teacher start _____(teach)
3.By the end of last term,we _____(learn) many English words.
4.Where's jim?he ____(go) to Canada
1.had rung 过去的过去,用过去完成时
2.teaching start doing sth开始做某事
3.had learned 同第一题
4..has gone 表示去了某处还未返回