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

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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
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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.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.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

teaching
have learnt
have been

teaching
had learned
has gone

1.had rung (by时间短语后动词用完成时,前面有got为一般过去 所以用过去完成)
2.teaching (start+doing)
3.had learned
4.has gone