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A:Whenleaving,B:Whenoneisleaving,C:Leaving,D:Whenonehadleft()acarinthiscarpark,thebrakesmustbeleftout

题目详情
A:When leaving,B:When one is leaving,C:Leaving,D:When one had left
()a car in this car park,the brakes must be left out
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答案和解析
C.
A C 的逻辑主语不对,D时态不对