【单选题】Nobody but doctors or nurses and those ________ by Dr. Hun ________ to enter the patient's room. [ ]
B.
are invited; are allowed
C.
being invited; allowed
【单选题】在常见的汽油发动机管理系统当中,当发动机的转速超过系统中设定的最高转速时,系统将( ),来抑制转速无限制上升,以保护发动机。
【单选题】当电喷发动机的转速超过系统的最高限速时,电喷系统将通过()来限制发动机的转速。
【单选题】Nobody but doctors and those _______ by Dr Smith ______ to enter the patient’s room.
C.
being invited; is allowed
D.
being invited; are allowed