1.Please bear in mind that nobody but doctors or nurses____ to enter the patient's room.
A. allow B. allows C. is allowed D. are allowed
【答案】C
【解析】
【详解】考查时态和语态。句意:请记住,只有医生和护士才能进入病人的房间。分析句子可知,本句的主语是nobody为不定代词,故谓语动词应用第三人称单数,且allow与主语之间是被动关系,故填is allowed。故选C。