It is said that e-textbooks are going to be ___ A.used B.kept C.cheaper D.brighter 为什么要选择A?

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It is said that e-textbooks are going to be ___ A.used B.kept C.cheaper D.brighter 为什么要选择A?
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It is said that e-textbooks are going to be ___ A.used B.kept C.cheaper D.brighter 为什么要选择A?
It is said that e-textbooks are going to be ___ A.used B.kept C.cheaper D.brighter 为什么要选择A?

It is said that e-textbooks are going to be ___ A.used B.kept C.cheaper D.brighter 为什么要选择A?
就是被用的意思啊.
语态是动词的一种形式,它表示主语和谓语的关系.语态有两种:主动语态和被动语态.如果主语是动作的执行者,或者是说动作是由主语完成的,要用主动语态;如果主语是动作的承受者,或者是说动作不是由主语而是由其他人完成的,则用被动语态.