用for,since,before或者ago填空.
问题描述：
用for,since,before或者ago填空.
1we have lived here（ ）ten years 2i never made cakes（ ） 3they have studied English （ ）three years（ ）4two weeks has passed （ ) she went to hangzhou
答
1we have lived here（ for ）ten years
2i never made cakes（ before ）
3they have studied English （since）three years（ago ）
4two weeks has passed （ since ) she went to hangzhou
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