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Please tell me the after service of the computer; I’m worried about         a break down sometime.

       A．there being          B．it being               C．there is                D．it is

Please tell me the after service of the computer; I’m worried about         a break down sometime.

       A．there being      B．it being     C．there is     D．it is

Please tell me the after service of the computer; I’m worried about        a break down sometime．

       A．there being          B．it being               C．there is               D．it is

Please tell me the after service of the computer; I’m worried about         a break down sometime.

 Please tell me the after service of the computer; I’m worried about        a break down sometime．

       A．there being          B．it being               C．there is               D．it is