War and peace______a constant theme in history.A、isB、areC、had beenD、have been

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问题 War and peace______a constant theme in history.

选项 A、is
B、are
C、had been
D、have been

答案 A

解析由and连接的两个主语系指同一人或同一种事物及概念时，谓语动词用单数形式，再如：Bread and milk is helpful to health．

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