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    23．Doctors say it will be many years scientists develop an effective treatment for AIDS. A．when B．since C．before D．as 【查看更多】

     

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    Doctors say it will be many years ___________ scientists develop an effective treatment for AIDS.

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

     

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    Doctors say it will be many years ___________ scientists develop an effective treatment for AIDS.

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

    查看答案和解析>>

    （2010·江苏赣榆县城头高级中学高三第一次调研考试）    23. Doctors say it will be many years ___________ scientists develop an effective treatment for AIDS.

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

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