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(Ever since) the world (began) nations (have difficulty) in (keeping) peace with
(Ever since) the world (began) nations (have difficulty) in (keeping) peace with
游客
2025-03-12
37
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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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