2. 外语
  3. (Ever since) the world (began), nations (have difficulty) (in keeping) peace with their neighbors.

(Ever since) the world (began), nations (have difficulty) (in keeping) peace with their neighbors.

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问题 (Ever since) the world (began), nations (have difficulty) (in keeping) peace with their neighbors.
选项 A、Ever since
B、began
C、have difficulty
D、in keeping
答案C
解析 应改为have had difficulty。ever since引导句子的时候，从句用过去时，主句要用现在完成时。
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