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Don't play games on the computer all day, It's ______ to your eyes.

A. harmful

B. useful

C. helpful

D. thankful

A 【解析】句意:不要整天在电脑上玩游戏,对你的眼睛有害。本题考查形容词。A. harmful有害的;B. useful有用的;C. helpful有帮助的;D. thankful感激的。根据句意选A。
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