_____是be kept to do还是be kept doing?hhthanks

_____是be kept to do还是be kept doing?hhthanks 为什么是must be kept而不是must to be kept [D100] I am sorry to _____ you waiting outside so long.A.keep B.be keeping C.have kept D.to be kept翻译并分析 to believe 还是 to be believe 为什么还有个be to do believe 是动词 为什么还加be --what else aren't allowed to do during the meating?--oh,all the mobile phones must( )A keep offB be kept offC keep onD be kept on Friendship is like money,easier made than__?A.kept B.to be kept 比较...Friendship is like money,easier made than__?A.kept B.to be kept比较级than前后的词是并列关系吗? Friendship is like money,easier made than kept 为什么不用 to be kept?难道因为than一定加动词原形do 1.If city noises ____ from increasing,people ____ shout to be heard even at dinner．　　A． are not kept；will have to　　B． are not kept；have　　C． do not keep；will have to　　D． do not keep；have to选A noises是不可数名 是be reluctant to do还是be reluctantly to do? phones must be kept off _____ the talk what _____(be) they going to do tomorrow? He was said ___ to the dancing party.A.to be prevented from go B.to be kept going C.to be prevent going D.to be stopped from going请问大家为什么选A呢?为什么from 后面是DO呢？不是doing吗？ 在数据库文档中,be kept up to date是啥意思啊is kept up to date by a transaction log replication process If world peace _____ kept,every country should contribute its efforts.[A] should be[B] is to be并说明原因 Our room must ___ clean.A.keep B.be kept C.to be D.kept 女声英文慢摇一开头是 to to be do,do be do,do be do be do be do.很有节奏感 请大虾赐教歌名 I'm going to be a basketball player的同义句 I'm going to do _____ _____ _____. I do not think anyone will be ready to do it,_____?反义疑问句