[求助]最新真题15题第2题

2.     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）

(E) Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh

答案E。请问A不好的原因。谢谢!!

In choice A ,there are two unattached sentence ,but there is no conj. to connect them.

"therefore" is an adv.