A:When leaving,B:When one is leaving,C:Leaving,D:When one had left

问题描述:

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

C.
A C 的逻辑主语不对,D时态不对答案是B,我一直想不通啊答案确实是B, 我打错了,AC是一样的。本题的句子的主语是 the brakes, 谓语是must be left out. 动词的ing形式作状语时,它的动词和主语是主动关系。也就是说:AC中的状语相当于when the brakes leave, 这显然是不对的。B中的one指的是人,所以是对的。意思是:将车放在停车场时,一定不要刹车(估计指的是拉手刹)