本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 + S' d5 ]" Y' v {% `9 B% [
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Last night, I took part in a party. u0 d" v. w/ @ t& |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.