题目内容

8._________ across the railway,a train hit it.(  )
A.While walking
B.Walking slowly
C.As the little pig walking
D.While the little pig was walking

分析 在这只小猪穿过铁路时被一辆火车给撞了.

解答 答案D.因为主句的主语a train 和walk across the railway没有关系,所以不能用省略,因此否定ABC.而D项表示"当这只小猪穿过铁路时",主谓齐全,所以选择D.

点评 考查时间状语从句.
状语从句在省略时,并非任何成分都可以省略而是遵循下面原则:
  (1)当状语从句的主语与主句的主语一致时,可以省略状语从句的主语和系动词be
  如:Once (he was)a worker,Pang Long now becomes a famous singer.庞龙曾经是个工人,现在变成一位著名的歌手.
(2)当从句的主语是 it,谓语动词中又含有系动词be 时,可以把it和系动词be一起省略.此时构成连词(if,unless,when,whenever)+形容词的结构.
如:Unless (it is) necessary,you'd better not refer to the dictionary.如果没有必要,你最好不要查字典.

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