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 在這只小豬穿過鐵路時被一輛火車給撞了.

解答 答案D.因為主句的主語a train 和walk across the railway沒有關(guān)系,所以不能用省略,因此否定ABC.而D項表示"當這只小豬穿過鐵路時",主謂齊全,所以選擇D.

點評 考查時間狀語從句.
狀語從句在省略時,并非任何成分都可以省略而是遵循下面原則:
 。1)當狀語從句的主語與主句的主語一致時,可以省略狀語從句的主語和系動詞be
  如:Once (he was)a worker,Pang Long now becomes a famous singer.龐龍曾經(jīng)是個工人,現(xiàn)在變成一位著名的歌手.
(2)當從句的主語是 it,謂語動詞中又含有系動詞be 時,可以把it和系動詞be一起省略.此時構(gòu)成連詞(if,unless,when,whenever)+形容詞的結(jié)構(gòu).
如:Unless (it is) necessary,you'd better not refer to the dictionary.如果沒有必要,你最好不要查字典.

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