请教大牛一个以前没注意的语法规则！！！

aaroncheng

关于形容词引导的不定式前置的？ 下面是prep上的一道题目：
Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore refused to carry even a pound of mail, despite being offered $1,000 to do so.
A.    Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore
B.    When Charles Lindbergh was attempting his solo transatlantic flight, being very reluctant to have any extra weight on his plane, he
C.    Since he was very reluctant to carry any extra weight on his plane when he was attempting his solo transatlantic flight, so Charles Lindbergh
D.    Being very reluctant to carry any extra weight on his plane when he attempted his solo transatlantic flight was the reason that Charles Lindbergh      
E.    Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh

题目释义：Very reluctant to have any extra weight ….., Charles Lindbergh refused to …….., despite…..…
主语是Charles Lindbergh，形容词引导的不定式前置，修饰主语，谓语为refuse to do sth，despite引导的状语从句，修饰谓语，表转折。


ABCD 很容易排出， 但是我的疑问是，Very reluctant to have any extra weight.... 这个所谓的形容词引导的不定式前置到底是怎么用的？