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   there is a snowstorm or some other bad weal. her, the mail always comes on time.

    there is a snowstorm or some other bad weal. her, the mail always comes on time.

       A．Because   B．If      C．When       D．Unless

   there is a snowstorm or some other bad weal. her, the mail always comes on time.

　 there is a snowstorm or some other bad weal. her, the mail always comes on time.

A．Because 　　　　 B．If　　　　　　　　 C．When　　　　　 D．Unless