单选题 No freshman and no graduate student ______ to sit in on the forum.
A. are allowed B. is allowed
C. are approved D. is approved

【正确答案】 B

【答案解析】[解析] 由两个no修饰的两个单数名词作主语时，谓语动词仍用第三人称单数。句子谓语要求用第三人称单数的还有以下结构：more than one...；one after another...；every...and every...；each...and each...；each and every…；many A…and many A...。