Clare finally decided to leave the company she ____ for since she graduated from university.   [ ]

A. would work       

B. has worked      

C. was working  

D. had worked

分压式偏置放大电路中对静态工作点起到稳定作用的元件是（）。

A.集电极电阻

B.发射极旁路电容

C.发射极电阻

D.基极偏置电阻