问题描述：
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When Mrs.Richards went towards him,he fled ,slamming the door behind him（同义句转换）
On seeing Mrs.Richards_______ towards him,he fled.
A.to walk
B.having walked
C.walk
D.walked
Key:c
Please explain it clearly to me.
Why not choose
When Mrs.Richards went towards him,he fled ,slamming the door behind him（同义句转换）
On seeing Mrs.Richards_______ towards him,he fled.
A.to walk
B.having walked
C.walk
D.walked
Key:c
Please explain it clearly to me.
Why not choose
问题解答：
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