There is someone knocking at the door.It may ________ (be) the po_英语解答

There is someone knocking at the door.It may ________ (be) the postman.
如题

人气：421 ℃　时间：2019-08-19 09:38:54

解答

be （情态动词后跟动词原形）有人在敲门,可能是邮递员