Visitors have been asked to keep the woods clean and tidy.请问中间为什么_英语解答

Visitors have been asked to keep the woods clean and tidy.
请问中间为什么用have been asked

人气：121 ℃　时间：2020-05-29 06:33:32

解答

have been 表示过去完成时
ask sb. to do sth 是词组,让某人做某事,要求某人做某事
访问者/游客被要求保持森林整洁