If the law and order______, neither the citizen nor his property is safe.

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问题 If the law and order______, neither the citizen nor his property is safe.

选项 A、are not preserved
B、have not been preserved
C、were not preserved
D、is not preserved

答案D

解析 本句意在陈述一项事实,所以应采用一般时,law and order是习语,意为“治安”,抽象名词,表示一个概念,用作单数。
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