They?not,get) their books yet.填哪种形式的否定式?
问题描述:
They?not,get) their books yet.填哪种形式的否定式?
答
现在完成时,haven't,因为yet是完成时的标志
They?not,get) their books yet.填哪种形式的否定式?
现在完成时,haven't,因为yet是完成时的标志