题目内容
5.Air must fresh ail the time.It's good for our health.( )A. | keep | B. | is kept | C. | be kept |
分析 空气必须一直保持清新,这对我们的健康有利.
解答 答案C 情态动词的被动语态结构:情态动词+be+过去分词.空气的清新是被人类保持的,也就是keep这个动作的承受者,所以要用被动语态.故选C.
点评 首先要明白情态动词被动语态的构成,然后结合句意做出正确选择.
练习册系列答案
相关题目
15.-Is Johnson in the classroom?
-Maybe not.I saw him ________the dining hall just now.( )
-Maybe not.I saw him ________the dining hall just now.( )
A. | entering | B. | enter | C. | to enter |
13.--Why are you so tired these days?
--Well,I have ________ work to do.( )
--Well,I have ________ work to do.( )
A. | too much | B. | too many | C. | much too | D. | many too |
20.The final exam is coming.Our teachers tell us _____ time.( )
A. | not to waste | B. | not waste | C. | don't waste |
10.Very loud noises make people i11.So we make great noise( )
A. | must; mustn't | B. | need; needn't | C. | can; mustn't | D. | must; can't |
17.There an English SpeechC ontest in No.7Middle School the day after tomorrow( )
A. | will have | B. | will is | C. | will be |