B该句子谓语不完整，由空格前的have been可知此处需要动词过去分词构成被动语态，充当谓语。根据句子主语ideas or transformations。可确定答案为introduced。what great ideas or transformati

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答案B

解析该句子谓语不完整，由空格前的have been可知此处需要动词过去分词构成被动语态，充当谓语。根据句子主语ideas or transformations。可确定答案为introduced。what great ideas or transformations have been introduced意为“引入了什么重大的思想成果和变革”。

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大学英语六级

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B该句子谓语不完整，由空格前的have been可知此处需要动词过去分词构成被动语态，充当谓语。根据句子主语ideas or transformations。可确定答案为introduced。what great ideas or transformati

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PlayIsaSeriousBusinessA)Playingisaseriousbusiness.Childrenengrossedinamake-believeworld,foxcubsplay-fightingo

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