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The system of Braille is really _____________ to the blind.

A.of great usefulB.great usefulC.great useD.of great use

D

解析试题分析:句意:盲人系统对盲人真的是有用的。这里使用be of+抽象名词=形容词,great是形容词修饰名词use,of great use="very" useful,所以选D。
考点:考查介词短语

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