本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 - U% `" P7 h H W# \& X" K- Q0 Z: z/ M8 YLast night, I took part in a party. \ R) m9 V K1 t3 {
Last night, I was taking part in a party.
to me, all 4 are ok and acceptable. depend on where and how you are going to use them. picking one over another doesn't make the sentence any more or less sophisticated.