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___ he has finished writing the novel is unknown. 

A. If                                  B. Whether                     C. When                         D. While

___ he has finished writing the novel is unknown. 

A. If                                  B. Whether                     C. When                         D. While

___ he has finished writing the novel is unknown. 

A. If                                  B. Whether                     C. When                         D. While

___ he has finished writing the novel is unknown. 

A. If                                  B. Whether                     C. When                         D. While

___ he has finished writing the novel is unknown. 

A. If                                  B. Whether                     C. When                         D. While