Although he knew little about the work done in the field of physics, he succeeded ________ other experienced expects failed.

1. A.
   in which
2. B.
   in what
3. C.
   where
4. D.
   what

 Although he knew little about the work done in the field of physics, he succeeded ______other experienced experts failed.
  A. which            B. that            C. what            D. where

Although he knew little about the work done in the field of physics, he succeeded ________ other experienced expects failed.

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