Air must _____ fresh all the time.A. keep B. is keep C. be k

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/06 15:53:55

Air must _____ fresh all the time.A. keep B. is keep C. be kept 应该选哪个? keep有被动吗?
我们老师说主系表结构keep没有被动,

“Be + 过去分词”可能是被动语态也可能是系表结构.被动语态表示以主语为承受者的动作,而系表结构则表示主语的特点或所处的状态.

( A )7.Air must _____ fresh all the time. 这里是系表结构,表示主语所处的状态.
A. keep B. is keep C. be kept

( B )8.Our room must ___ clean. 这里是被动语态,表示主语承受的动作.
A. keep B. be kept C. to be D. kept

food fresh in the fridge.a is keep b is kept c is keeping d keep the window ____ to let the fresh air in . A.close B.clo The book can_________for a week.A.keep B.kept C.is keep D.be The air ( ) fresh .A:is B:are C:am We must keep all the windows -----.A close B closed We should keep our rooms clean and the air fresh all the tim 英语翻译书上的问题是：Must we keep the window ( )all the time.A.opening 英语：keep用法1.We must keep the classroom .A.clean B.to clean C. would you please keep the window___?let the fresh air in.A o 1、We must keep the _____ mushrooms fresh.(dry) 2、There will Our room must ___ clean.A.keep B.be kept C.to be D.kept all of you must keep your eyes 几个选项 a.close b.closed c.closi