to improve the students’sight the eye exercises are done in schools nationwide. A. Being

问题补充：

to improve the students’sight, the eye exercises are done in schools nationwide.

A. Being designed

B. To design

C. Designing

D. Designed

答案：

A. Being designed

B. To design

C. Designing

(答案→)D. Designed

解析：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。