A lot of new technology _ into schools to make learning more effective these years.A introduced B has introduced C was introdueced D is being introduced

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A lot of new technology _ into schools to make learning more effective these years.A introduced B has introduced C was introdueced D is being introduced

A lot of new technology _ into schools to make learning more effective these years.A introduced B has introduced C was introdueced D is being introduced
A lot of new technology _ into schools to make learning more effective these years.
A introduced B has introduced C was introdueced D is being introduced

A lot of new technology _ into schools to make learning more effective these years.A introduced B has introduced C was introdueced D is being introduced
D is being introduced
首先这里introduce是“引进,引入（技术等）”的意思而不是“介绍”的意思,此处略类与鲁迅先生在提及木刻画时所使用的“绍介”一词,两种用法有区别,要注意.“介绍给谁”或者名词introduction“对什么的介绍”时后面的介词要用“to”,这是最容易犯错的地方,切记.
这个地方的意思是指新的教学技术正在被引入以使学习变得更有效率.所以用被动式进行体而不用被动式一般过去式.technology是抽象名词,用单数.

C

D由these years知时态为一般现在时或现在进行时，又技术与介绍之间为被动关系，所以选D

答案是C
这里是一个被动语态，“A lot of new technology ”是被引进学校的，被动语态是be动词+动词分词形式，明显A没有be动词，B 也没有be动词。D是过去进行时，整个语境时态是these years，不对。所以答案是C

楼上的回答不正确。首先从时态方面考虑就不对了：（1）C是一般过去时的被动语态，这与these years这点不符。these years常常与现在完成时连用的。（2）A、B排除。因为题中的technology和这个 introduce是被动的关系（被动的结构为be+动词的过去式），A被动结构不对，B也是。（3）虽然these years常常与现在完成时连用，但运用排除法得出答案为D.可以这样理解，...

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楼上的回答不正确。首先从时态方面考虑就不对了：（1）C是一般过去时的被动语态，这与these years这点不符。these years常常与现在完成时连用的。（2）A、B排除。因为题中的technology和这个 introduce是被动的关系（被动的结构为be+动词的过去式），A被动结构不对，B也是。（3）虽然these years常常与现在完成时连用，但运用排除法得出答案为D.可以这样理解，D是现在进行时的被动语态，我们可以说“这些年大量的新技术"一直"被引进到学校使得教学更具效率”,即‘一直’这个概念。
特别的，其实这道题的完美答案应该是 has been introduced.这样的话时态和语态都符合了。

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