3 weeks before 和 before 3 weeks 意思一样么?还有 after

3 weeks before 和 before 3 weeks 意思一样么?还有 after two weeks before和two weeks ago区别! two weeks before 与before two weeks哪个对 several weeks ago 换现在完成时,是several weeks before还是for several weeks 这两句话(或者短语a few more weeks和a few weeks more）有什么区别?I was staying there for a few more weeks before I came back to New York.I was staying there for a few weeks more before I came back to New York. I bought two souvenirs before two weeks哪里错了? two to three weeks before the shipment of products 3 more weeks weeks. weeks long before和before long before 和before long before和before I haven't seen her ()A.two weeks ago B.since two weeks C.for two weeks D.before two weeks选什么为什么?句意? in three weeks 和in three weeks'time 的区别 in two weeks和after two weeks的区别 two more weeks和more two weeks各是什么意思 已知正方形ABCD和等腰直角三角形BEF,BE=FE,∠BEF=90,按图1旋转,使BF于BC重合,取DF的中点G1、EG、CG的位置关系与数量关系,证明2、△BEF绕B点顺时针旋转45度得图2,问1中的结论是否成立3、△BEF旋转任