____ four years since I joined the Army.A. There was B. There is C. It was D. It is为什么选d不能选c啊?

I became a teacher four years ago.(改为同义句)I ____ ____ a teacher ____ four years . four years Four Years The World Cup is held every four years.(保持句意) The World Cup is ____ _____ every four years. four years,over Four Years Old 歌词 four years before The Olympic Games ____ held every four years.空格处填is还是are呢? ,and both are held every four years on a ___ ____ the olympic game are held ____ a.each four year b.every four years c.every fourth yearsthe olympic game are held ____ a.each fourh year b.every four years c.every fourth years a.every four yearb.each four yearc.every fourth yearsd.each fourth years the olympic games谓语单复数问题The Olympic Games ____ held every ____ years.A.is; four B.are; four C.is; five D.are; five every four years代表什么 every four years什么意思? 同义句转换;He could speak English when he was four years old He ____ ____ ____ speak English when h They lived here (for about four years).对括号里的时间提问____ _____ _____they live there jim has studied in the USA for four years的同意句 jim has studied in the USA ____ four year ___?急jim has studied in the USA for four years的同意句jim has studied in the USA ____ four year ___? they have been living here for four and a half years同义句they have been living here for ___ ___ ____ ___ ____. four-year 和four years有什么区别?