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Only when        .

       A．did he arrive the meeting began     B．he arrived did the meeting begin

       C．did he arrive the meeting begin     D．he arrived the meeting began

 Only when _______ .

         A．did he arrive the meeting began      B．he arrived did the meeting begin

         C．did he arrive the meeting begin       D．he arrived the meeting began

 Only when        .

       A．did he arrive the meeting began            B．he arrived did the meeting begin

       C．did he arrive the meeting begin            D．he arrived the meeting began

Only when _________________.

Only when _________________________.