How much the latest version of this novel is is not clear.
老师,这句话的书写有没有问题?
把上述句子改成How much the latest version of this novel remains unclear是不是通顺点。
谢谢老师!
语法上没问题,两个is放一块确实最好改一下,有人把这种情况描述为stylistically horrid。这就像你写汉语句子,一个句子若用相同的词太多了,也让人觉得不舒服,显示出没水平。