第5题: [单项选择]Only under special circumstances ______ to take make-up tests. A. freshman are permitted B. are freshman permitted C. permitted are freshman D. are permitted freshman 参考答案:B 答案解析:倒装结构题。only及其后的条件状语位于句首时,主句的谓语动词需要部分倒装,本题的谓语为被动语态are permitted,属于复合动词形式,be动词提前,做部分倒装,故[B]正确。