互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本,课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒[答]by 在此表示“到(某时)为止”或“到某时”已发生某事或出现某种情况,谓语动词多用完成时态。句中的1840是过去时间,因此谓语动词用过去完成时had come, 又如:
By the end of last year we had produced 3000 computers. 到去年年底为止我们已生产出3000台电脑。
She had finished her work by the time I came home. 我回家时他已干完活了。
By next week we will have made a plan for our journey. 下周前我们会订出旅行计划。
9. Since the mid-1980s growing numbers of Asians have settled in New Zealand, and they make up about 6% of the total population. 自从80年代中期以来,定居在新西兰的亚洲人数不断增加,他们占新西兰总人口的6%。