every few years 中,few前为什么不加“a”?我的意思是：为什么不写成every a few years

every few years 中,few前为什么不加“a”?我的意思是：为什么不写成every a few years Every few years和for many years是什么意识 very four years every other year every few years什么意思?造句? every few years,the coal workers have their lungs X-rayed to ensure their health 为什么不选have hadevery few years不是现在完成时的标志吗 every year 与every years i go home every other years.but every time i_____there for a few days.A Stay B wait C stand D leave原因! in the past few years a few hundred years ago every few minutes为什么不是every a few minutes 为什么是every few minutes而不是every a few minutes 请问few的否定意义如何体现?Few people can live to be 100years.这句话中few的否定意义如何体现?没人能活到100? 遇到句子中有in the past few years,前面应该用什么时态 Every few years,the coal workers （）their lungs X-rayed to ensure their health.A.are having B.have C.have had D.had had In some provinces in _ southern China,serious flood breaks out every _ few years.A.the;a B./;a C.the;/ D./;/ 英语翻译At last,the brother who had drunk tea every day died at the age of 83,the other died a few years later. The Olympic Games______held every four years.横线中应该填“are”为什么?The Olympic Games______held every four years.横线中应该填“are”为什么不是填“is”？ 英语翻译If we imagine a flat plane with the sun in the center and the planet revolving around it,the Earth slowly moves in and out of the flat plane by a few degrees,repeating the cycle every 100000years.还有这句话中FLAT PLANE是什么东 every four years代表什么