in the last few hours,my sister ( )her badroom three timesA.has cleaned B.was cleaning C.would clean 求答案、为啥呢?

IN THE LAST HOUR in the last few in the last few years是什么时态 1 on the last few day 还是in the last few day（s） 还是on the last few days in the last few years还是in the last few yearRT in the last few days为什么用last? in a few hour's 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 for the last few years和 in the last few years的区别 i'd had reson enough in the last few months.如何理解last?如何理解few? in the last few years 为什么要加 the in the last few years=over the years吗 in the past few years和in the last few years的区别, in the last few days 和 in the past few days 是否可以互相替换? the last few over the last few in the last few years 用什么时态 in the last few years 有 在最近几年里