本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 / _8 h% t/ C' u7 ^) g' p; ]/ p ' G# C; `5 b" R+ hLast night, I took part in a party.# Q, N. ?8 Z& m- w
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.