本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 ; S% n9 P4 v- Y. a) y; K ' z5 r3 V& K: u7 i. O1 pLast night, I took part in a party. ) G: L+ z+ U9 j! B' vLast 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.