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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