(Ever since) the world (began) nations (have difficulty) in (keeping) peace with

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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、keeping

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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BecausetheUnitedStatesisnotsurroundedbymanyothernations,someAmeri-ca