2. 外语
  3. War and peace______a constant theme in history.

War and peace______a constant theme in history.

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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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