My pleasure.

來源: EnLearner 於 2011-01-17 18:24:08 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (173 bytes)
回答: Thank you for posting! 由 學英語3151 於 2011-01-17 15:37:50

 

I am not aware of any simple rule on this.

Guess when there is a doubt, check the dictionary.

 

 

 

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