____ across the railway ,a train hit it.A While walkingB Walking slowlyC As it was walkingD While the sheep was walking

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____ across the railway ,a train hit it.A While walkingB Walking slowlyC As it was walkingD While the sheep was walking

____ across the railway ,a train hit it.A While walkingB Walking slowlyC As it was walkingD While the sheep was walking
____ across the railway ,a train hit it.
A While walking
B Walking slowly
C As it was walking
D While the sheep was walking

____ across the railway ,a train hit it.A While walkingB Walking slowlyC As it was walkingD While the sheep was walking
D While the sheep was walking
否则,从句中主语不明.

A.这题没指名人物,所以直接用动名词形式就可以了

D
排除A/B,由于主语不统一,不能用非谓语形式。

应该考的是独立主格结构。
前后为两个句子,两个句子的主要都不同。
前面的主语显然与后面的a train 不是同一主语。所以前面的主语不能省略。答案选D

D While the sheep was walking
否则,从句中主语不明。

选择D,it指代动物

答案是D. A,B错在前后主语不一致,C指代不明确