he has finished writing the novel is unknown.A. IfB. WhetherC. WhenD. While

发布时间：2020-08-16 08:00:25

     he has finished writing the novel is unknown. 
A. If
B. Whether
C. When
D. While

网友回答

A. If
(答案→)B. Whether
C. When
D. While
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