If the south had won the war, what is now the United States______divided into se

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问题 If the south had won the war, what is now the United States______divided into several countries.

选项 A、will be
B、might have been
C、should be
D、must have been

答案 D

解析本题考查虚拟语气。与过去事实相反用过去完成时态表示虚拟，且表示肯定的推测用must。

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