一道四级英语选择题...请高手帮答下.
I don't know who_____the electronic wires again.It is the time that some measures_____to prevent it.
A.has stolen,were taken B.stole,were taken
C.has tolen,are taken D.stole,are taken
麻烦帮具体解释下为什么和这道题考的语法点是什么..