英文成語 let the cat out of the bag
 
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英文成語 let the cat out of the bag
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let the cat out of the bag 

My sister did not let the cat out of the bag about her promotion until all the relevant contracts were signed.

放出袋中貓(洩密,說漏嘴)

直至所有相關合約也簽署完成後,妺妹才説出她升職的事宜。

(源自澳專國際教育集團)