问题补充：
I saw a woman running toward me in the dark.Before I could recognize who she was,she had run back in the directionshe had come.
A. of which
B. by which
C. in which
D. from which
答案：
A. of which
B. by which
C. in which
(答案→)D. from which
解析：对于定语从句中关系词的选用根据先行词及关系词在定语从句中所做的成分来确定，而这里四个选项关系词都是which，不用再进行选择；关系词前面的介词的选用与先行词和后面的定语从句的动词有关，这里定语从句中的动词come与它连用的介词是from，表示“来自” 符合题意，故选D
