本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 ; v# ]/ Y' h& y) E1 `( S/ f+ u" L9 z- k, F, a, M+ \' S: F
Last night, I took part in a party. : ~+ N4 J1 `! q( D, tLast 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.