精选优质文档-倾情为你奉上畅游学海敢搏风浪誓教金榜题名。决战高考，改变命运。凌风破浪击长空，擎天揽日跃龙门专项四代词.语法填空(根据语境填入适当的代词)1Mary waited for a reply, but _ came.答案none句意：玛丽等待回信，但没有等来。此处none相当于none of the replies，符合题意。2Usually there might be a lot of accidents in the heavy fog.I happened to witness _ this morning.答案one句意：通常在雾中会发生很多事故，我今天早上就碰巧看到了一次。此处表示“一次事故”应用one (accident)。3(2015开封市高三模拟) The power failure made _ difficult for us to complete the task on time.答案it句意：停电使得我们按时完成任
