变频器中间直流环节的储能元件用于完成对逆变器的开关控制。( )
参考答案：B
We have decided to accept the proposal that he _____ his new theory.
We have decided to accept the proposal that he _____ .
A．offer
B．offering
C．offered
D．would offer
------Did you attend Professor Johnson’s lecture about the evolution of videos and sound devices?
------I wish I __________. I __________ a job interview with the UN.
A．had, had
B．had, was having
C．could, have had
D．could have, were having
