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回答: 大家共同學習。。。Arline2011-10-06 10:35:19

 

 

覺得用 has proven, 後麵要加東西. For example: has proven to exist; has proven true, et al.

 

 

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you are right -Arline- 給 Arline 發送悄悄話 Arline 的博客首頁 (140 bytes) () 10/06/2011 postreply 13:35:08

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