高中英语动词时态语态一题After class,the student went out of the classroom one by one,but only Mary_____.A.left B.had left C.was leaving D.was left它的答案是A,我就奇怪为什么不能选D?干嘛非要用省略?与only 有关么?

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高中英语动词时态语态一题After class,the student went out of the classroom one by one,but only Mary_____.A.left B.had left C.was leaving D.was left它的答案是A,我就奇怪为什么不能选D?干嘛非要用省略?与only 有关么?

高中英语动词时态语态一题After class,the student went out of the classroom one by one,but only Mary_____.A.left B.had left C.was leaving D.was left它的答案是A,我就奇怪为什么不能选D?干嘛非要用省略?与only 有关么?
高中英语动词时态语态一题
After class,the student went out of the classroom one by one,but only Mary_____.
A.left B.had left C.was leaving D.was left
它的答案是A,我就奇怪为什么不能选D?干嘛非要用省略?与only 有关么?

高中英语动词时态语态一题After class,the student went out of the classroom one by one,but only Mary_____.A.left B.had left C.was leaving D.was left它的答案是A,我就奇怪为什么不能选D?干嘛非要用省略?与only 有关么?
答案A:left 这句话翻译来就是:下课后,同学们一个接一个的离开了教师,唯独Mary留下来了. 这个“留下”的动作是Mary 自己主动发出的,而不能选was left (表示被动).
only只是强调作用,强调只有Mary一个人没有离开,而不是什么省略.
现在有没有明白呢?