In 1999, the government spent about $ 39 billion to ______.

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In 1999, the government spent about $ 39 billion to ______.

A. improve the prison conditions

B. keep men and women in prison

C. build houses for prisoners

D. maintain the prisons

参考答案:

B38.答案为B。根据第一段最后一句,the cost in 1999 for keeping all these prisoners behind bars is about $39 billion作出该项选择。these prisoners指men and women。