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____ he will come or not is still unknown.     

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

____ he will come or not is still unknown.     

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

____ he will come or not is still unknown.     

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

____ he will come or not is still unknown.     

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

____ he will come or not is still unknown.     

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