---- he has finished writing the novel is unknown.为什么用whether,

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----hehasfinishedwritingthenovelisunknown.为什么用whether,----hehasfinishedwritingthenovelisunknown.为什么用

---- he has finished writing the novel is unknown.为什么用whether,
---- he has finished writing the novel is unknown.
为什么用whether,

---- he has finished writing the novel is unknown.为什么用whether,
他是否已经完成了小说是不为人知的.
在主语从句中只能用whether来引导,而非if

是否的意思