本帖最后由 hua_chris 于 2013-8-6 14:25 编辑 ; T) F+ e# c9 G: n' B& [: U" E4 o1 Z
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Last night, I took part in a party. 9 @3 w8 I3 X: W1 ILast 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.