Water must be kept from running away.这里面keep系动词不是无被动语态会进行时态吗那这个里面为什么还用 be kept

为什么是must be kept而不是must to be kept must be the water Water must be kept from running away.这里面keep系动词不是无被动语态会进行时态吗那这个里面为什么还用 be kept 70.Water must be kept _______away.A.to run B.runs C.running D.from running70.Water must be kept _______away.A.to run B.runs C.running D.from running Water must be kept _______away.　A.to run B.runs C.running D.from runningkeep不是系动词吗?不是主动表被动吗?那为什么用kept 后面为什么加from running 固定用法吗?、 Our room must ___ clean.A.keep B.be kept C.to be D.kept the room must be kept wet.变成被动语态! The medicine must be kept away from children翻译 翻译：The wheels of industry must be kept turning. What we talked must be kept private翻译 phones must be kept off _____ the talk They urged that the library _________ open during the vacation.A.must be kept B.is kept C.would be kept D.be kept 翻译Dirty water must not be mixed with drinking water. The medicine *cool,clean and dry.*处应选择哪个答案:A must keep B must be kept C must be carried D must be in This kind of food___cool,dry.A.shoud be placed B.must be kept选择哪个? Our room must ＿＿clean.A.keepB.be keptC.to be kept D.to keep The book ____ from the library must be kept well.The book ____(borrow) from the library must be kept well. It is desirable that the automation equipment_running as much of the time as possible.A.would be kept B.must be kept C.will be kept D.should be kept