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 Expertshavebeenwarning   ofthehealthriskscausedbypassi...

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問題詳情：

 Expertshavebeenwarning   ofthehealthriskscausedbypassi...

 Experts have been warning    of the health risks caused by passive smoking


   A. at a time     B. at one time    C. for some time   D. for the time

【回答】

 


C 


解析：本題考查固定短語。從句中have been warning 可知，應用for some time 一段時間，at a time 每次；at one time 曾經。

知識點：固定句型

題型：選擇題

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