【題目】If law and order ______, neither the citizen nor his family is safe

A. are not preserved

B. is not preserved

C. were preserved

D. have not been preserved

【答案】B.

【解析】此處主語 law and order 指的是同一個概念，所以謂語動詞要用第三人稱單數(shù)形式.

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