本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 / D7 K9 r1 Y6 k6 v9 N' j" ~0 J " l% I0 R; _4 O( j' CLast night, I took part in a party. % ^4 P$ b) N4 ?0 ~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.