分类：教育/科学-外语学习-英语考试
问题：WhenI________bythestation,Isawth? 
When I ________by the statn , I saw the accident_________.A past;happeningB passed; happendC past ;to happen D passed;hapen
回答：WhenI________bythestation,Isawtheaccident_________.Apast;happeningBpassed;happendCpast;tohappenDpassed;hapen选D,楼上两位肯定错的。第一个空要填动词,passed是pass的过去式, 越过,晚于; ss的过去分词。happen不及物,没有被动形式。(你打错了,D少打一个p,B少打一个e)hear/see/watch/notice/observe/find/feel/lookat/listento+sb./sth.+do/doing/donedo强调的是(看到/听到……)全过程doing强调的是(看到/听到……)正在做done强调的是被动“ ”的被动是“ seentodo”“ ing”的被动是“ seendoing”“ ne”的被动是“ seendone”“ ”的被动是“ madetodo”