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。