_______to improve the students’sight,  the eye exercises are done in schools nationwide.
A．Being designedB．To designC．DesigningD．Designed
D
本題考查非謂語動詞。句意：為提高學(xué)生的視力而編制的眼保健操，在全國學(xué)校內(nèi)推廣。句子的主語為the eye exercises，與design之間為動賓關(guān)系，用被動形式；being designed表被動、進行，不合題意。因此選D。
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