一、让步状语从句中的倒装
1)让步状语从句中的倒装形式为：强调对象+as/though+主语+其它部分，强调对象可以是表语(名词，形容词)或状语(副词)。表语为名词时，前面通常不用冠词。
【例如】
Tired as he is, he goes on with his work.
Much as he likes her, he does get irritated with her sometimes.
Child as he is, he knows how to please the others.
2) be+主语+or连接的两个表语。这个句型相当于whether…or…引导的让步从句。
【例如】
Be it cheap or dear, I will take it.
We should put our energysintosour work, be it mental like the work of a scientist or physical like the work of a smith.
二、以only引导状语位于句首引起的倒装
Only by shouting at the top of his voice was he able to make himself heard.
Only in this way can we achieve what we want.
Only in each afternoon does the university library open.
Only under special circumstances ____to take make up tests.
A) are freshmen permitted
B) permitted are freshmen
C) freshmen are permitted
D) are permitted freshmen
Only加状语位于句首，句子用倒装语序，故答案为A。
