P5板上的双引气灯是由（）
A.P5板上APU引气电门控制
B.P5板上左空调组件电门控制
C.APU引气活门上的一个电门控制
D.以上全对
参考答案：C
I’m delighted _______ as chairman of the students’ union last winter.
A．to appoint
B．to be appointed
C．to have appointed
D．to have been appointed
My family four members. [ ]
A. have
B. has
C. are
