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

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

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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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