____ hard before,Tom is afraid of failing in the exam.A.Having never worked B.Never have workedA为什么不对?这个顺序有什么讲究?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 05:23:57

____ hard before,Tom is afraid of failing in the exam.A.Having never worked B.Never have workedA为什么不对?这个顺序有什么讲究?
____ hard before,Tom is afraid of failing in the exam.
A.Having never worked
B.Never have worked
A为什么不对?这个顺序有什么讲究?

____ hard before,Tom is afraid of failing in the exam.A.Having never worked B.Never have workedA为什么不对?这个顺序有什么讲究?
非谓语动词的否定式要在非谓语动词前面加否定词
比如 tell sb not to do sth
not having done