The water company is obliged to maintain a supply of wholesome water.

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问题 The water company is obliged to maintain a supply of wholesome water.

选项 A、available
B、hydraulic
C、balanced
D、hygienic

答案D

解析 句意:这家水厂有责任维持对卫生水源的供应。wholesome健康的,卫生的。hygienic卫生的。available可利用的。hydraulic水力的,水压的。balanced平稳的,安定的。
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