袋鼠男 发表于 2014-7-17 17:41
one of the scenarios present perfect could be used: completing of an action before another action.
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lirong123 发表于 2014-7-18 20:41
不是,你没理解什么叫general rule, 比如Sandy plays well with her friends, 并不是说她哪一次跟朋友玩 ...
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