题目内容
The system of Braille is really _____________ to the blind.
| A．of great useful | B．great useful | C．great use | D．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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