问题描述：
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?
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?
问题解答：
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