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    There is no point advocating banning smoking in public ________ the law is introduced.
    A．whenB．unless
    C．sinceD．because
    B
    B 考察连词。句义：除非成为法律条文，否则在公共场所倡议禁止吸烟是没有意义的。When当..时；unless除非；since自从；because因为；故B正确。
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