【单选题】 Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.
A.an easy
B.a playful
C.an open
D.a better
网考网参考答案:D
网考网解析:
improved:improve的过去分词,在句中起形容词的作用,即修饰learning environment,表示“改进了的,更好的”,与better意思相近。easy:容易的。playful:顽皮的:闹着玩的。open:公开的;开着的。
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