Only under special circumstances ________ to take make-up tests. [ ]A. are freshmen permittedB. permitted are freshmenC. freshmen are permittedD. are permitted freshmen

本题考查倒装句的用法，特别是"only + 状语"开头的句子的倒装结构。解题关键在于：

1. 确定倒装类型：当"only"修饰状语（如地点、时间、方式等）且置于句首时，主句需使用部分倒装。
2. 识别主谓关系：原句中主语为freshmen，动词为are permitted（被动语态），倒装时需将助动词are提前至主语前。

句子结构分析

原句完整形式为：
Freshmen are permitted to take make-up tests only under special circumstances.
当"only + 状语"（only under special circumstances）置于句首时，需将助动词are提前至主语freshmen前，形成倒装结构：
Only under special circumstances are freshmen permitted to take make-up tests.

选项辨析

• A. are freshmen permitted：正确倒装结构，助动词are提前。
• B. permitted are freshmen：错误，permitted是形容词，不能直接跟助动词。
• C. freshmen are permitted：未倒装，不符合语法要求。
• D. are permitted freshmen：错误，permitted与主语freshmen位置颠倒，导致主谓搭配错误。