The boy went in _______ when he left for school that he left his key inside the house.

A．a rush so anxious

B．a such anxious rush

C．so an anxious rush

D．such an anxious rush

对电气控制系统，每月要进行一次绝缘性能试验和（）试验，及时发现问题，消除隐患，对动作不灵活或动作准确差的元件应及时修理或更换。