The pilot lost control with the military base,       the plane crashed in the desert.

1. A.
   by means of which
2. B.
   for which
3. C.
   in case of which
4. D.
   as a result of which

The pilot lost control with the military base,        the plane crashed in the desert.

       A．by means of which  B．for which

       C．in case of which             D．as a result of which

The pilot lost control with the military base,       the plane crashed in the desert.

A. in case of which   B．for which         C．as a result of which D．by means of which