本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 : a8 c) V4 {) S% G6 W% a8 t/ M/ D8 i# I
Last night, I took part in a party. % t, t% F- c5 g( x8 s/ s! t) h+ P( fLast 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.