本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 " e c& Z9 M' J* z9 ^- o % L% p9 }9 r: @Last night, I took part in a party. ) y3 }7 ~9 D' X! l8 K3 n5 u; d+ kLast 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.