UC知道：想知道神马，提问回答学习问题百度都知道

Visitors have been asked to keep the woods clean and tidy.

来源：百度知道编辑：UC知道时间：2024/06/15 23:51:21

请问中间为什么用have been asked
这里的ask什么意思啊

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

此处用的是现在完成时的被动语态，故用have been asked
ask 在这里的意思是:要求。

There were hundreds of visitors waited outside to have a look at Van Gogh's paintings. B:When do you have art? visitors to the Disney parks They___friends since they met in shanghai?A.have made B.have become C.have been D.have had Where ( ) your parents ()dinner?a.do have b.are eat c. does have My parents __ for more than fifteen years.A,have got married B,have been married If you want to meet him,you _____wait.A.have to B.will have to A: ________ time do you have lunch? B: I usually have lunch at 12. it's time ( )breakfast. A.have B.has C.having D.to have I__a cold for a week.A,have had B,have caught.应该选哪个,为什么?