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

原为拉铆结构组装的配件，重新铆装时须为（）结构。

A.拉铆

B.焊接

C.螺栓紧固

D.开口销紧固