问题
选择题
．Nobody but doctors or nurses and those ________ by Dr. Hu
________ to enter the patient's room.
A．invited；is allowed
B．are invited；are allowed
C．being invited；allowed
D．invited；are allowed
答案
答案：A
答案 A [nobody在句子中作主语，谓语动词用单数，invited为动词的过去分词作后置定语。]