-----------,a car knocked her down.
问题描述:
-----------,a car knocked her down.
A.Walking home
B.As she was walking home
C.While walking
D.When she had walked home
这题为什么选B了,而不是abc中的一个,
答
当然走回家时,(确认要走回家的路上,所以进行时)
D排除
如果用A或C,那么后面句子的主语应该是she,而不是car