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 Scientistssayitmaybefiveorsixyears

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問題詳情：

 Scientistssayitmaybefiveorsixyears

 Scientists say it may be five or six years ____ it is possible to test his medicine on human patients. 

A. since            B. after               C. before            D. when

【回答】

C

知識點：動詞

題型：選擇題

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