为什么in the last few months 中 few前面不加a

为什么in the last few months 中 few前面不加a I__ a great deal in the last few months .为什么是have accomplish every few years 中,few前为什么不加“a”? in the last few years 为什么要加 the i'd had reson enough in the last few months. 英语翻译In the last few months,there's been a lot of emphasis in in a few months' times in the last few a few years ago前为什么不加介词in in the last month和in the last few months时态是否一样? in the last few years in the last few days为什么用last?