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

A(Ever since) the world B(began) nations C(have difficulty) in D(keeping) peace with their neighbors.

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问题 A(Ever since) the world B(began) nations C(have difficulty) in D(keeping) peace with their neighbors.
选项
答案C
解析 应改为have had difficulty。因为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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