SINCE/BY THE YEAR OF2000的区别

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SINCE/BY THE YEAR OF2000的区别
jake has studied chinese in this school_____the year of 2000
A since B in C on D by

选since
因为时态是现在完成时,且句意是Jack自2000年至今一直在这所学校学中文.
since自从.开始以后
by...到什么时候为止也经常用现在完成时,但句意不同,比如Jack has studied 10 courses in this school by the year of 2000,意思就变成了截止到2000年为止,Jack已经在这所学校学习了10门课程.再比如There has been over 100 people injured in the earthquake by 30 July,意思是截止7月30日为止,地震受伤人数已超过100人.

SINCE/BY THE YEAR OF2000的区别想问您by year 和by the year 的区别 at/in/on/since/by the end of 的区别 by year 和 by the year的区别. 如果表示工资等以年付用哪个? year by year 与 year after year 的区别 at for since by的区别 year by year,year after year的区别～具体点哈． year by year和year after year的区别,专家来请问in the 1840s与since the year 1840有什么区别? year after year与year by year区别 year by year与year after year有什么区别 year by year和year after year有什么区别?