Nobody but doctors or nurses and those __by Dr Hu__to enter the patient's room.
问题描述：
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:are invited；is allowed D:invited；are allowed
答
A 第一处空 过去分词作定语修饰those
第二个空考的是主谓一致,句子的主语是nobody这个不定代词,是第三人称单数,所以用is allowed