none is afraid of difficulties,do they?这个是错的
句子是主系表结构,后面问句要用系动词be
像你说的那样,应该是：
none is afraid of difficulties,are they?
请在客户端右上角评价点“满意”即可,我也这样觉得，但是我后答案用的是do答案肯定错了！ 这是常识。no one knows you are here,后面接do they还是does 调和油呢？do they?