【題目】__________ to improve the students' sight, the eye exercises are done in schools nation-wide.

A. Being designed B. To design

C. Designing D. Designed

【答案】D

【解析】句意：眼保健操是為了改善學生視力而設(shè)計，全國各地的學校都在做眼保健操。句子的主語為the eye exercises，與design為動賓關(guān)系，用過去分詞作狀語

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