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_______to improve the students’sight,  the eye exercises are done in schools nationwide.
A.Being designedB.To designC.DesigningD.Designed
D
本题考查非谓语动词。句意:为提高学生的视力而编制的眼保健操,在全国学校内推广。句子的主语为the eye exercises,与design之间为动宾关系,用被动形式;being designed表被动、进行,不合题意。因此选D。
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