Must we keep the window opening all the time这个句子对吗

英语翻译书上的问题是：Must we keep the window ( )all the time.A.opening keep the window open 还是keep the window opening 【20分】You ought to keep the windows opening all the time. We must keep all the windows -----.A close B closed We don’t need to keep asking for money all the time(保持句子意思不变 英语it is very hot ,may I keep the window all the time,A openi May I keep the window( ) all the time? ------No,you can't. A the open window还是the opening window 这个句子的被动语态：we must keep the classroom clean 谢 We must shut the window.就shut the window提问 We'd better keep the window _____. shall we keep the window close?改错