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

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

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

答案B

解析 此处主语law and order指的是同一个概念,所以谓语动词用单数形式。
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