答案解析

查看更多优质解析解答一举报1 时间 for+一段时间、since+过去时间、since+一般过去时的句子如：Howlong have you learned English?For 3 years .

/Since 3 years ago.

/Since I came to this school.

2 长度 how long is the river?About 2000 kil.

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