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 few years和for many years是什么意识 in the past few years 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 very four years every other year every few years什么意思?造句? in the last few years=over the years吗 in the last few years是什么时态 in the past few years造句 a few years down the road 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. in the past few years 过去完成时 in the last few years 现在完成时 in the past 一般过去时 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 In some provinces in _ southern China,serious flood breaks out every _ few years.A.the;a B./;a C.the;/ D./;/ the last/next/first 相当于冠词?the last few years a few years什么东西? for the last few years和 in the last few years的区别 in the past few years和in the last few years的区别, during the last few years与during the last a few years有区别吗? the old man died______.A.for a few years B.since a few years C.a few years ago D.a few years 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