输油泵不供油或供油中断主要原因可能是顶杆或活塞卡住，活塞弹簧折断。

I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back

in the direction _          she had come.         [ ]

A. of which                      

B. by which        

C. in which                      

D. from which