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______ he referred to in his article was unknown to the general reader.

   A. That     B. What  C. Whether     D. Where

______ he referred to in his article was unknown to the general reader.

  A. That            B. What              C. Whether               D. Where

______ he referred to in his article was unknown to the general reader.

  A. That      B. What          C. Whether            D. Where

______ he referred to in his article was unknown to the general reader.

  A. That            B. What              C. Whether               D. Where

____ he referred to in his article was unknown to the general reader.

 A. That        B. What         C. Whether       D. Where

              he referred to in his article was unknown to the general reader.

 A. That                B. What             C. Whether          D. Where

 ______ he referred to in his article was unknown to the general reader.

   A. That       B. What          C. Whether       D. Where

 ______ he referred to in his article was unknown to the general reader.

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______ he referred to in his article was unknown to the general reader.

   A. That     B. What  C. Whether     D. Where