His compass proved______ to him when he was lost in unknown country.

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问题 His compass proved______ to him when he was lost in unknown country.

选项 A、precious
B、precise
C、valuable
D、preferable

答案C

解析 valuable a.宝贵的；贵重的，有价值的。precious a.珍贵的，贵重的。precise a．精确的，准确的。preferable(to)a.更可取的，更好的，更合意的。

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